NASC 315 - Environmental Science
Introduction to Environmental Science
Environmental science can be defined as a branch of knowledge concerned with the study of the
interactions between people and their surrounding environment. It seeks to assess the systems in
the natural world and how human beings’ conduct impacts these systems. Environmental
scientists analyze emissions, the proportion of using or exhausting natural resources, global
temperature change, species extinction and the development of environmentally sustainable
programs for the Earth.
Scope of Environmental Science
As mentioned previously, environmental science as a field of knowledge unites a lot of
information and touches upon several fields and disciplines.
1. Ecology: This paper aims to discuss the history of the methodology of the multi-tiers of
the system organization in organisms’ interaction with the ecosystem energy and
nutrients.
2. Biology: Covers subject matters that connect Biologics and biologics and the surrounding
environment including; the preservation of the biological; diversity; and the state of
ecosystems.
3. Chemistry: Chemical events in the encompassing world are pollution, nutrient cycles, and
fluctuations of the elements and compounds including the gaseous structure of the air and
the particles of water and silt.
4. Physics: Enumeration includes aspects such as the weather system or the energies that are
being distributed in the systems including the food chain or web systems and also the
likes of earthquakes and tsunamis among others.
5. Geology: revolves around the activities, processes as well and patterns in the Earth, the
influence of human activities such as miners and land uses on the Earth's crust mineral
resources and geological hazards.
6. Sociology: Combs population’s conduct, dealings, and ethos for developing persona,
principles, and openings that augur the environment.
Interdisciplinary Nature of Environmental Science
This kind of scientific discipline can be defined as a specific sphere of knowledge dealing with
environmental concerns based on the data and approaches of various branches of science. Here’s
how each discipline contributes:
• Biology: Thus, helps the organisms to understand what is it that concerns the subtitles
of the body species distribution, sharing the natural resources and effects of the
species on the possibility of the regulation of the functioning of the ecosystems.
• Chemistry: Studies characteristics of contaminants, reactions on the pollutant and
changes and behaviors of pollutant substances.
• Physics: It supports Climatology or weather and hydrological cycle, energy in food
chains, and the characteristics of the physical geographies of the Earth.
• Geology: Provides sound recommendations on the structure of organizations
worldwide, the application and management of resources, and geological risks.
• Sociology: Multiple characteristics include the historical approach, environmental
legislation, and aspects of sustainability on the relations of people with the
environment.
The importance of an interdisciplinary approach in environmental science can be explored
further through several key aspects:
1. Holistic Understanding: Environmental issues are always multifaceted and hence are not
instigated by one factor and on the same scale do not impact one dimension. Such
processes involve biological, chemical, physical, geologic and social and in most
incidences they are interrelated.
2. Systems Thinking: Environmental systems are many and are enormous; they can be
related in that they are all open systems meaning that if one system is changed then this
may influence another system. Systems thinking is the center of interdisciplinary studies
which means that scientists link the individual components of the environment in the way
that each one depends on the other. It helps estimate the repercussions that follow when
environmental roles are assumed and, as a result, their causes are prevented.
3. Innovative Solutions: Most of the time, decision-making processes employed in complex
environmental contexts are the complex ones, which require inter-disciplinary
knowledge. For example, how the practice of sustainable agriculture bears in assimilating
the biological information of the genotype of crop plants with the ecology of soil and
biochemistry of nutrients. The latter can then be used by interdisciplinary teams to
develop better and more sustainable technologies, policies, and management
mechanisms.
4. Policy and Decision-making: There are other proofs suggesting that regulation and
policies of the environment stemmed from science, social direction and concern, political
influences and movements. An interdisciplinary approach provides policymakers with
information and results from several fields to help them manage the conservation of the
environment, the social, and the economic aspects.
5. Education and Communication: As concerning the process of disseminating such
complicated, multiple-meaning messages and ideas in the environmental field to the
targeted lay audience, the policy-makers and the other interested stakeholders are to
translate the environmental science as the discipline having their knowledge base and the
unique codes of thought and references into socially meaningful and recognized
concerns. This is thus reasonable and beneficial in the management of scientific research,
particularly in addressing the dissemination of scientific information to the populace and
in establishing connections between research and practice or among agencies.
Ecosystems and Biodiversity
Ecosystem Structure and Function
Components of Ecosystems
Biotic Components:
Ecosystems consist of a wide array of biotic factors; these are the living components that
are found in an ecosystem. These include:
Plants: Organisms that directly use sunlight in the synthesis of food and other energy-
bearing compounds from carbon dioxide and water.
Animals: Energy consumers that get their energy from plants, other animals, or both
depending on their diets which include plant matter, other animals or both in the case of
omnivores.
Microorganisms: Such organisms are bacteria, fungi and protists that engage in cycling of
nutrients and decomposition in the ecosystem and symbiotic associations.
Organism components include the biotic factors that create complicated relationships like
predation, competition, and mutualism, which affect population and ecosystem stability.
Abiotic Components:
They refer to factors in ecosystems that are non-living entities however they influence other
entities in the ecosystems. These include:
Soil: Assists in plant growth; provides rigidity, and water which are elements of plant
nutrition. Like in the distribution of plants, plant species richness is affected by
characteristics of the soil such as pH, texture and nutrient level in the soil.
Water: Highly essential in performing cellular functions quality, intake of nutrients and
regulation of temperature. The availability of water determines the work capabilities of
environments and the likely spotting of a particular organism.
Air: Gas components for example oxygen, carbon dioxide and nitrogen which a
significant gases for respiration, photosynthesis and other duties in the atmosphere.
Sunlight: Power for forming the biosynthesis products, forming the primary producers,
and is associated with the temperature changes in ecosystems.
Nutrients: Some of those which are included are carbon, nitrogen, phosphorus and others
that are essential to be cycled in to the biological systems in the Earth through the
biogeochemical cycles.
While the abiotic factors of the environment create the environment and also specify where
certain organisms ought to exist in the same ecosystem, the biotic factors.
Organization of Ecosystems
Ecosystems exhibit hierarchical levels of organization that reflect the complexity of interactions
between biotic and abiotic components: Besides this, ecosystems possess yet other numerous
characteristics including the degree of organization which defines bio and physiochemical
structures in the context of their interactions.
Organisms: These are the individual organisms, and these are also referred to as the
population level of any ecosystem if broken down in simple terms. It implies that they are
socially related to other organisms as well as to the physical environment in which they
live.
Populations: The created populations are considered as real groups of individuals of the
same type dwelling in separate territories exhibiting particular relations with other
inhabitants of this territory. Density therefore comprises such aspects as birth rate, death
rate or the mobility of people within a specific region as well as other regions.
Communities: Certain groups of populations or species that have been established as
founded in a particular environment and are capable of frequent physical interfaces are
termed ecologic communities. It is the competition using resources, predation and
symbiosis that determines here the structure of the certain community and thus the
variety within the community.
• Ecosystems: Ecosystem can therefore be described as the interaction of the living
beings with the non living items in the surroundings. These are the works and powers
in the food chain, nutrient cycling and the cycling of the material and energy between
the biotic and the abiotic compartments.
Biodiversity:
‘Biodiversity’ is the acronym for ‘Biological Diversity’, which means the variety of life forms
on Earth. It tracks various aspects including the number and variety of species hurt and
threatened, the variation of the genes in specific species and the number and variety of habitats
that are lodged in a particular region or worldwide. Biodiversity is critical to the health of
ecosystems and a valuable resource for human societies.
Types of Biodiversity:
Genetic Diversity:
The definition of Genetic diversity is the difference in genetic details that exist in a species of an
Organism. It involves dissimilarities in genes, alleles, and genetic characters available in all
species of living organisms and which used to alter in line with environmental variations.
Progenitor gene variation strengthens the species’ tolerance to diseases, climate alteration and
other ecological conditions by offering a diversity of gene traits for selection.
Species Diversity:
A species is a population of individuals of the same species living in one particular area and
engaged in the same activity. It involves the total quantity of species that are available which is
species richness and the distribution of these species, species evenness. And species richness has
many important roles in basin ecosystems because species-rich communities are more resistant to
any disturbances and fluctuations in conditions.
Ecosystem Diversity:
+Ecosystem diversity is the measure of the numbers and types of ecosystems present from the
local geographical scale to the whole planet. This covers the land, freshwater and marine biomes
where the environment of each one is defined distinctly by the physical, chemical and biological
characteristics. Little biodiversity plays a role in biodiversity because it hosts many species and
technical processes useful to the ecosystem and its attendant services.
Importance of Biodiversity:
Ecological Stability Ecological Stability:
Biological diversity is essential for stability and the ability to recover systems that make up the
biosphere. They contain more resilient species and functional richness because multiple species
and functions support the systems’ capacity to rebound in the event of a disruption including
natural disasters and human interferences. Such processes as nutrient cycling, soil formation and
water purification strongly rest on bio-diversity and are frameworks to maintain ecosystem
health and productivity.
Economic Value
Ecosystem services offered by biodiversity include various functions that can fertilize
human societies and improve the economy. These services include:
Pollination: It is very important for such crops grown in the agricultural fields and other
natural vegetation available in the region.
Water Filtration: Through filtration, wetlands and forests ensure that water is clean,
affecting water quality.
Climate Regulation: Trees in the forests and bodies of water control local and global
climates, by taking in carbon dioxide.
Medicinal Resources: Some drugs are obtained from plants and animals and all these
empower human health in one way or the other.
Hence, there is the economic value of biodiversity in agriculture, fish farming, forestry and the
tourism industries, where these various aspects of ecosystem health are productive and
sustainable.
•Cultural Significance
Cultures, customs, and beliefs of societies are also intrinsically linked with the given territory's
bio-diversity. Sadly, many indigenous peoples rely on the available biodiversity for food,
medicine and other kinship practices. Biodiversity too has economic importance from scenic or
artistic views, recreational (bird watching, eco-tourism) and artistic and cultural values.
Threats to Biodiversity:
1. Habitat Loss and Fragmentation:
+Habitat destruction and division are mainly attributed to human activities such as; settlement,
agricultural expansion, deforestation, and construction of other facilities. Such activities result in
the direct or indirect alteration or simplification or destruction of habitats or habitation; therefore,
the reduction in the availability of good habitats for so many other species. This scheme can
involve dissecting the connectivity, which means that various populations of the species are
unable to breed, thus making the species vulnerable to climatic changes and disasters. Successful
conservation of habitats has been acknowledged as the most common cause of species
extinctions globally.
2. Climate Change:
Climate change can be defined as the alterations in the patterns of climate over a very long
period due to various factors, and the most significant of such factors are fossil fuel consumption
and cutting down trees. Climate change affects species distribution and their ranges, phenology
and residency or encounter probabilities of specific habitats. For habitats with strict climatic
requirements, rapid climate change may prove to be a problem that would, in turn, result in the
depopulation of certain ranges.
3. Pollution:
Pollutants like pesticides, heavy metals, plastics, and chemical pollutants being dispersed into
ecosystems have adverse impacts on wildlife and destroys them. They can also be deposited in
soil, water sources, and food chains thus leading to harm of species in aspects concerning health
and reproduction. Pollution also causes changes in the environment, degrading habitats and any
toxic substance is known to cause toxicological effects on any organism at all levels of biological
organization.
4. Overexploitation:
Overexploitation happens when some of these resources are used by men beyond the rate at
which their replenishment can be done by nature. Some of these are fishing of the aquatic
species, poaching, and selling of prohibited animals and birds. This is because overexploitation
of the given species reduces the stock of other valuable species, disturbs the sustainable
ecological system and endangers endangered species. Management exercise and legislation form
the other preventive measures against the adverse effects of overexploitation on biodiversity.
5. Invasive Species:
Invasive species are articles that originated from another geographical location and spread in an
ecosystem at high speeds, thus dominating the native species for resources like food, space, and
habitation. These species have the potential to change the ecological processes, modify the
characteristics of habitats, and cause declines of species and even species’ extinctions in those
habitats. These species are of great threat to the conservation of bio-diversity especially in the
island and any isolated locale where native species have not developed a defense system against
an invader.
Implications and Conservation Strategies
•Ecosystem Resilience: More importantly, the conservation of biological diversity is
regarded as a social issue because it calls for a response to threats that affect
biological organisms’ stability and which may diminish the ecosystem’s ability to
meet global environmental changes. Among these are the rehabilitation of the habitat
area, the conservation of protected areas, and the creation of landscape connectivity,
which control effects of habitat split up and division.
•Policy and Regulation: The key essential steps, that are necessary to resolve these
problems, are sufficient formation and the fulfillment of the regulations and policies.
The abovementioned agreements, such as the CBD and other regional conservation
initiatives, are aimed at furthering the efforts and preserving the biotic variety in the
whole wide world.
•Community Engagement: Main Positive Recommendation Improvement The
implementation of the local communities in the practices of conservation of resources,
and usage of the knowledge of local people will enhance the support for species
conservation and the means of livelihood support. Awareness creation and education
can also be blamed that has resulted to poor environmental conservation and people’s
responsibilities towards the environment.
Environmental Pollution
Types of Pollution
1. Air Pollution:
Pollution of the air is the availability of substances that are injurious to the human body and
wildlife; this is a result of social vices like industrialization, the use of cars and the burning of
fossils. These are particulate matter commonly referred to as PM, sulfur dioxide or SO2, nitrogen
oxides or NOx, carbon monoxide or CO, and volatile organic compounds or VOCs. These are
effects like smog, respiratory disease, production of acid rain, and global warming impairment.
2. Water Pollution
Water pollution is stated to happen when pollutants enter the systems of water, whether it is the
fresh water system of river, lake or groundwater or the marine water system of seas or oceans.
These are effusions from industries, the utilisation of pesticides and fertilizers in farming,
sewage, and oil. "
3. Soil Pollution:
Soil pollution entails the emancipation of poisonous material and particle including; chemicals,
heavy metals like lead, mercury, pesticides and industrial wastes. Such cases include; disposal of
industrial wastes, use of pesticides in farming, mining and industrial effluent, and urban storm
water drainages. In this aspect, soil pollution reduces the capability of germinating crops,
impacts food crops besides endangering ecological systems and human beings through food
chain and water.
4. Noise Pollution:
Noise is a loud and unwanted sound that negatively diverts the constructive effects of sound on
the environment, man and animals. These are from road and air transport, industries,
constructions, and any other activities such as games and other forms of recreation. Noise
pollution can cause hearing impairment, stress, and sleep deprivation to individuals, and hinder
human and animal communication.
Impacts of Pollution
•Environmental Impacts: Pollution thus affects ecosystems as it alters some of the
functions of the ecosystem, reduces the number of species and eliminates one’s
natural environment. For example, evils of pollutants, acid rain which produces sulfur
dioxide and nitrogen oxides damage forests, and reduce the efficiency of water
resources, and the soil. Various types of water pollution cause eutrophication,
unfavorable algal growth, and water organisms and fish deaths that help to destroy the
food chain balance of water bodies.
•Human Health Impacts: Pollution of the environment is hazardous to health as it
implies contact with toxic substances in the air, water and different strata of the soil.
Suspended solid cause respiratory illnesses that include Asthma, Bronchitis as well as
heart-related complications and Cancer. The diseases that are likely to be caused by
the pathogens and chemicals in the water are astrological, while the contaminated soil
might cause chronic diseases and developmental disorders in individuals when they
are young.
Mitigation Strategies
5. Regulatory Measures: The requirements and guidelines act as a magnitude on the
governments to have maximum permitted discharge rates for the pollutants as released by
diverse companies and wastewater plants. The Clean Air Act of the United States, the EC
water framework directive, the boards for pollution control in different countries can act
as case studies.
6. Technological Solutions: Higher development takes place in instruments that assist in
monitoring pollution and its effects. Examples of such cases include scrubbers employed
in industries to trap sulfur dioxide in the emissions to the atmosphere the filters known as
catalytic converters that filter out the NOx gases in vehicles and treatment plants that
exercise separation of waste products in sewage.
7. Sustainable Practices: Sustainability plays a role in enhancing the flow quality of
ecosystems given the fact that it reduces the utilization of resources, discharges of wastes
and hostile impact on ecology. They can be for instance; ecology farming to do away
with the use of pesticides, and water drainage systems that have vegetation that assists in
filtering pollutants such as; green energy, that is cutting down on the use of fossil energy.
8. Public Awareness and Education: Education on the effects of pollution enhances
consciousness by citizens and communities and chisels proper responses to pollution.
Some of the other educative programs that people are subjected to are those involving the
use of recycled materials, energy usage and transport usage and selection for reduction of
pollution levels.
Climate Change
Climate change is any change that affects the climate of a certain area or of the globe in general,
systematically, cumulatively and over time. Excessive human actions are the main source of
elevated climate change rates in the present generation. Key causes include:
• Greenhouse Gas Emissions: In electricity generation, as fuel, in transport services,
and for manufacturing the industries burn coal, oil, and natural gas thereby releasing
greenhouse gases such as carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O)
and other. These gases therefore help to trap heat which results in the enhanced
greenhouse effect and – global warming.
• Deforestation and Land Use Change: Election for the clearance of forests for
agricultural purposes, timber and city extension increased the inducement of
remaining soils to absorb CO2 through photosynthesis exercising more CO2 in the
atmosphere and modifying local climates.
• Industrial Processes: Industry releases GHGs and other emissions like black carbon
which warms to change and composition of the atmosphere.
Effects of Climate Change
Climate change impacts are universal and versatile and their impacts are seen in all the systems
and sectors and the near and the long-term impacts are seen in the local communities.
1. Temperature Rise:
Industries have been emissioning greenhouse gases in the atmosphere and trees have been cut
down on large scales, thereby the average world temperatures have been rising. This warming
fashion is partly to blame for the improvement of the heat waves in many regions of the Earth.
Temperature variations determine the capacity of the ecosystems; this means that an extent will
alter the growth of plants, the maturation of animals, and the probable species that may often be
found within any particular area. In human populace, they are familiar with their heat ailments,
heat strokes, and death especially the aged and those who work in the scorching heat.
2. Extreme Weather Events:
This global warming increases the incidence and the severity of natural events like floods,
hurricanes, storms, drought etc. Increased heat makes the air stronger and even moist, causing
more intense storms and rain. This is so because storms and flooding that is almost always
inevitable interfere with structures, “crop fields”, and water bodies and hence, result in the
destruction of properties of different forms, they also disrupt agricultural production hence
affecting food production and pose great threat to the lives of the personnel that may be affected.
On the other end drought also exacerbates the issue of water ration and also the yields of the
crops as well as the quantity of fresh water which is germane for the rearing of live stocks and
other water-use organisms.
3. Sea Level Rise:
+Melting of the glaciers and polar ice caps and expansion of the thermal seawater have in the
process led to an increase in the global sea levels. This research shows that the impact of the
increased sea level is detrimental and threatens the lives of people, ecosystems and structures in
the coastal counties and lowland areas. As for Climatic sensitive regions, more regular and
intensified charges are observed in the floods, shoreline erosion and, the salinity of freshwater
sources. Small island countries, inhabited shores and coasts and other coastal areas remain
exposed to sea level rise hence they are among those that cannot overlook measures toward sea
level rise such as the construction of sea walls, wetlands and establishment of new areas of
relocation.
4. Biodiversity Loss:
In this case, variations in temperature and precipitation change the ecological dynamics caused
by the occurrence and distribution of plant and animal species. Species may not have adequate
physiological or behavioral capacity, or concrete means to shift to favorable habitats when
conditions change, and can hence lead to shifts in the geographical ranges and potentially local
species’ gimmick. Some of these services include pollination, water purification and regulation
of climate and by degrading this system the chances of attaining pollination, purification of water
and regulation of climate is impeded. This is why the concept of conservation is of great
importance to try to protect the endangered species and the balance between species where the
effects of climate change have been realized.
Evidence from Scientific Studies
Scientific studies provide robust evidence of climate change through various indicators:
1. Temperature Records
This is in agreement with other global average temperature records, satellite records, as well as
other databases that clearly indicate a warming process in the world from the beginning of the
twentieth century. Provided by the Intergovernmental Panel on Climate Change (IPCC), the
subsequent decades appear to the warmer than the prior decade starting this time scale from the
year 1850. This warming especially the second one is unanimously linked with the increase of
the Green House gases particularly Carbon Dioxide (CO2) in the atmosphere resulting from
human activities such as the utilization of fossil energy and deforestation.
2. Glacial Retreat and Ice Loss
In general global studies, most of the glaciers that have been studied are retreating and thinning
primarily rapidly and ice shelves particularly in Greenland and Antarctica are more rapidly
melting than in any time. Remote sensing data obtained from space also indicate the likelihood
of a reduction in the coverage as well as the thickness of the Arctic as well as Antarctic sea ice;
this changes the polar landscape and the sea level.
3. Ocean Warming and Acidification:
Findings obtained from vessels, buoys, and satellites employed in oceanography analysis show
that ocean temperature has risen marginally in the recent past in the shallow light zones of the
oceans. This warming is majorly accredited to the impact created by the additional heat trapped
by the greenhouse gases in the atmosphere. Additionally, other higher concentrations of CO2
result in climate change while the majority of the CO2 is dissolved in water making the water
acidic hence a negative impact on many species of marine life that have outside covering that is
made of calcium carbonate.
4. Proxy Data:
Proxy data source creates and preserve the climatic history and the climatic data as counterparts
of climate conditions of the past to yield information on natural variations and tendencies. For
instance; Ice samples, which are collected from the polar region, rings of tree trunks, and coral
bodies collected from the fields of lakes and oceans. Concerning such proxies, climatic impacts
are noticed in terms of cycles of changes in temperature, changes in the content of the
atmosphere, and climate alterations within millennia. Thus, the analysis of such trends
concerning climatic history makes it possible to conclude that the rate and the amplitude of
temperature Increase characterized by decades may be considered unique within the framework
of Natural oscillations of climate.
Environmental Policy and Law
Major Environmental Laws and Regulations
1. Clean Air Act (United States): This act was formed in the year 1970, and was later amended
in some other year. They cause a lowering of National Ambient Air Quality Standards (NAAQS)
for some pollutants-Ozone, PM Particles, and PM 2. 5, sulfur dioxide, nitrogen oxides and the
States are expected to come up with the strategies on how they will be in a position achieve the
set standards.
2. Clean Water Act (United States): CAC: Clean Water Act At its inception in 1972, the Clean
Water Act works to support and improve the usefulness of the nation’s bodies of water by
regulating effluent and establishing water quality. It develops treatments for wastewater,
stormwater management and protection of wetlands and sources of drinking water.
3. Environmental Protection Act (Canada): It is a general environmental legislation that
provides a good indication of how to assess and manage environmental risks in Canada. It
encompasses items like: Air and water pollution, Disposal of hazardous materials, and Effects of
large development projects.
4. Water Framework Directive (European Union): The Water Framework Directive was
reached in the year 2000 and is focused on the protection and sustainable utilization of water and
its receptors in the EU region. The original EU Environment Program for the period 1983-1986
laid down goals for surface and ground waters, encouraged member states to adopt integrated
water management at the level of river basins, and demanded that member states: ‘It is necessary
to do everything possible so that the process of prevention and minimization of pollution was
activated. ’
5. National Environmental Policy Act (United States): Lever signed in 1970, NEPA aims to
make the federal agencies carry out a check between their plans and the expected impact they are
going to have on the environment through EIAs and EAs. This also intensifies accountability,
brings in the public and incorporates the environmental status into the federal process.
International Treaties and Agreements
1.Kyoto Protocol (1997): As such it is recognized under the United Nations Framework
Convention on Climate Change-UNFCCC as a protocol. This depicts particular legal obligations
where the industrialized countries are supposed to reduce their emission of greenhouse gases to
specified quantities below the 1990 levels in commitment periods. This has facilities such as
emissions trading and Clean Development Mechanical (CDM) to ensure that there is a decrease
in emissions at the international level.
2. Paris Agreement (2015): +The Paris Agreement (2015): Also entered under the UNFCCC, the
Paris Agreement is expected to take climate change action further even on a global level. This
also envisages long-term planning of the average global temperature below the threshold of 2
degrees centigrade. Half a degree Celsius above the pre-industrial level and preferably below that
of even half a degree. 5 degrees Celsius. The countries are expected to provide the emission
reduction goals and laid down planned actions in the NDCs.
3. Montreal Protocol on Substances that Deplete the Ozone Layer (1987): Montreal Protocol
is a treaty and it concerns the phase out of those substances that are infamous for depleting the
ozone layer or ODS like CFC and HCFC. It has been positive in the following areas in the later
lower, reduction, and provision of solutions to the questions of ozone depletion hence the
improvement of the environment and the health of people in the globe.
4. Convention on Biological Diversity (1992): CBD is convention on the conservation of
Biological living resources, Sustainable use of biological resources and access and the sharing of
benefit along lines out of utilization of genetic resources. As for the subject matter, topics like
loss of habitats, occurrence of unwanted species, degradation of ecosystems and the rest are
discussed in this stream of study whereas its concern involvesthe protection of biological
diversity locally and internationally.
5. Basel Convention on the Control of Transboundary Movements of Hazardous Wastes
and Their Disposal (1989): Based on the Basel Convention, its focus areas are the hazardous
wastes and their disposal particularly in the matter of trans bound transport, first with a view of
preventing generation of hazardous wastes; second in regard to their proper management that is
environmentally sound. This offers control measures; it sets P. I. C where transportation of
wastes between countries is a concern, and also promotes reduction in generation of wastes and
recycling of wastes.
Human Population and Sustainability
Population Growth Trends
Human population growth has experienced significant changes over time: Demographic density
pattern also undergoes massive transformations over periods in the human population.
Historical Trends: The people in the society have increased to so many, in particular, during the
period of the Industrial Revolution. Looking at the chronology, before getting to the year 2000,
people in the world numbered slightly over 1 billion, in the 1800s. This figure was passed to 7. 8
plus by the year 2020.
Current Growth Rate: As it is realized that the growth rate per capita is slowing down in the
world and especially in the developed countries where birth rates are low, many of the global
regions still have high rates of increase from factors like high birth rates and improved health
standards that result to esteemed lives.
Projected Growth: The forecast shows that the quantity of individuals all over the planet can
vary between 9 to 10 billion in 2050 with African and Asian countries being affected by the
demographic shift.
Impact on Material and the Environment
The increasing human population has profound impacts on natural resources and
ecosystems:
•Resource Depletion: People ask for essentials of life including water, food, energy
and raw materials and as the number of people in a particular area grows, the demand
for the aforesaid necessities also rises. Resource depletion is epitomized by such
things as using up of resources, and contaminating and degrading the environment.
•Land Use Change: Some of the activities for instance conversion of agricultural land
for other uses, urban development and creation of infrastructures alter the physical
characteristics of those surroundings and in so doing influence the availability of
adequate space as well as resources with negative consequences on the size of
biodiversity.
•Climate Change: This is so because population moderates energy consumption,
transportation and changes in land use, other negative impacts on climate change,
including global warming, rise in sea levels and extreme weather patterns are bound
to happen.
•Water Stress: This act of increase of population bears its effect of exerting pressure
on the accessibility of fresh water hence the ever increasing issues of water rationing
and competition of fresh water and its implications on provinces which depends on
source of fresh water.
Sustainable Development Goals (SDGs)
SCD is a list of seventeen goals of the United Nations in the process of the 2015 UN Sustainable
Development Summit as part of the promotion of the Agenda 2030. These goals are very much
interconnected and any issue that the society is facing socially, economically and
environmentally, it can be solved with a link to one or more of these seven goals of development.
Here's a comprehensive explanation of the SDGs:
1. No Poverty
Goal 1 aims at reducing extreme poverty transversal to countries through improving the chance
to be protected, productive assets and basic services among the poor especially the vulnerable
people. They are goals of development such as; the eradication of extreme poverty, reducing the
proportion of the population living in poverty, and implementing social protection measures.
2. Zero Hunger
Goal 2 is targeted at halting hunger, reducing malnutrition, as well as increasing the output of
agriculture that is sustainable. It seeks to minimize and eradicate hunger and food insecurity
regarding the access to, and the availability of, safe, healthy and adequate food for all people at
any time throughout the year; for this, it focuses on the promotion of sustainable farming
practices that assist to increase the capability of rather small producers, farmers and the food
production system.
3. Good Health and Well-Being
Concerning goal 3, the outcome emphasis is put on achieving and sustaining health for all ages.
It has targets on dimensions of prevention and treatment of mother and child illnesses,
communicable diseases including HIV/AIDS, malaria, and TB, and goals for enhancing health
systems for the promotion of UHC and access to key interventions.
4. Quality Education
The fourth goal aims at Gender Equality, Quality Education, Equity and inclusion, and a
Sustainable Future of Learning. It aims at increasing the raw literacy rate, as well as numerical
competence across the worldwide population; it focuses on education for all, and technical and
vocational schooling to increase the employment ratio and the world’s economic stability.
5. Gender Equality
Goal 5 focuses on addressing issues of gender and empowering all women and girls. To wit, it
has goals for of eradicating discrimination, leveraging, violence, and other negative actions
against women and girls, guaranteeing their education and healthcare rights and economic
opportunities, and fostering women’s representation and engagement in decision-making.
6. Clean Water and Sanitation
The sixth goal focuses on clean water and sanitation which aims at promoting the sound
management and availability of water and sanitation for all. It seeks to focus on access to
sustainable, safe, and affordable drinking water supply, adequate water caliber in the form of
reduced pollution, and adequate water availability, as well as the application of integrated water
resource management.
7. Affordable and Clean Energy
Goal 7 ensures the sound management, utilization and conservation of the energy resources in
the world for the development of the economy as well as increase in value in the quality of life of
persons. It sets them as the goals of share of renewable energy in the global final energy
consumption, efficiency improvement of energy and further enhancement of access to modern
energy in those countries.
8. Decent Work and Economic Growth
The eighth goal emphasizes development of sustainable economic growth model which
encompasses all and that at which decent employment is pursued as the means to the
achievement of this aim. In the long run, their objectives are to enhance the value of
macroeconomic efficiency for every worker by product specialization and technology
improvement, creation, and innovation other than better wages and salaries, social as well as
medical insurance at the workplace for the employees.
9. Industry, Innovation, and Infrastructure
The projected goal addresses industrialization for sustainable development, and improving
infrastructure for innovation. It focuses on the improvement of Infrastructure and modernization
of structures to make them environmentally friendly, Technological development, and
Information and communication technology facilities.
10. Reduced Inequalities
Goal 10 is dedicated to inequality within the world and among the countries. Targets in it: To
realise and build up incomes for forty percent of the population, empower or boost social,
economic as well as political status of each, and to champion for shares of opportunity
disregarding age, sex, disability, race, ethnicity, origin, religion or another position in the
economic stratum.
11. Sustainable Cities and Communities
Sustainable Development Goal 11 talks about the matters of sustainable urbanization and it has
only one goal namely making cities and human settlements sustainable, safe, inclusive, as well as
resilient. They aim at enhancing the availability of adequate stock of sound, cheap and secure
shelter and housing, slum enhancement, effective low producing urban land utilization and
management, the creation and development approaches of the city on all the above aspects
besides security/protection against all forms of disasters– natural and other.
12. Responsible Consumption and Production
Sustainable consumption and production is the issues covered in the 12th sustainable
development goal. It is a helpful minimization of wastage production and is geared towards the
management and utilization of resources at different and individual stages in the life cycle, and it
also improves the worth of companies and customer in the preservation of the environment.
13. Climate Action
The last goal involve an aspiration to act quickly in relation to climate change and its impact. It
envisages the improvement of the level of coping and adaptation to climate risks for the purposes
of climate change legislation of policies, goals, and procedures into the development strategies
and plans of the country, climate change education, awareness rising, and boosting of climate
change mitigation and adaptation, and reduction of climate change vulnerability, and risk.
14. Life Below Water
Eco-social goal 14 is focused on the conservation and sustainable use of the oceans, seas, and
marine resources for development. Thus, it aims to minimize pollution of the maritime
environment, preserve marine and coastal environments, and control fishing and overfishing to
replenish fish populations as vital contributions to SDGs.
15. Life on Land
Goal 15 helps promote the conservation and sustainable usage of the terrestrial ecosystems,
sustainable use of forests, combating desertification, the effecting the process of land
desertification, and avoiding the loss of the biological wealth. These are from the preservation of
biological diversity and restoration of land to the sustainable use of the forests and ecosystem.
16. Peace, Justice, and Strong Institutions
Goal 16 relates to the aspect of peaceful societies for sustainable development; rule of law,
access to justice; and strengthened accountability to action at all levels of government. Targets
for which are to use violence less, for non-use of abuse and exploitation, for the rule of law, and
for equal access to justice and state’s services.
17. Partnerships for the Goals
The inputs applied concerning Goal 17 stress that international cooperation is a crucial factor in
achieving the UN Sustainable Development Goals. It aims to raise the engagement of the global
society in the development of developing countries, in the effective functioning of cooperation
with the sectors of public, private, and civil spheres and enhance the funds required to perform
the SDGs.
It depicts the image of the world in regard to efficiency by which global challenges are to be
solved without inflicting much harm on the earth. Ideally, these objectives are most effective
when implemented with the support of teams and getting people and Governments all over the
world on the process that leads to sustainability and nobody should be left out.
Importance of Conservation Practices
Ecosystem conservation is the best towards the realization of other functions in the enhancement
of human life such as water provision, food, weather among others. Practices like preserving the
buildings, objects and this leads to the preservation of the species of the living organisms,
genetic variation as well as the seven natural extents of the habitat. They also for sustainable
agriculture, fisheries and forestry for food security and income generating activities feet.
Types of Conservation Practices
oProtected Areas: Transforming the appropriate and concrete protected areas
including national parks, wildlife conservancies, and marine parks carries out the
basic exercise of the meeting conservation of biological diversity. It is therefore
applied to defend the threatened species, put an end to the release of substandard
habitat for wildlife and enhance habitat quality.
oHabitat Restoration: Reforestation, wetland rehabilitation, and linkages are
useful in improving the state of ecosystems and their components – the physical
and the biological structures. Restoration programes are commenced in detail to
aid in the process of the rehabilitation of such areas influenced by negative
actions like deforestation, expansion of human beings’ settlements, and pollution
activities.
oSustainable Land Use: Anytime the society is enlightened on the conservational
practices such as agro, forestry, and organic farming, integrated landscape
management among others, then cases of environmental degradation will be
expected to reduce parallel to the enhancement of productivity among the rural
areas. These practices improve the general status of the agricultural soils and
water as far as fertility and play a role in the enhancement of biological status
within the region.
oWildlife Conservation: With regards to the other forms of conservation they are
Measures in the preservation of species that are in danger of extinction,
prosecution of people involved in the smuggling of wildlife and humane wildlife
management. Therefore, conservation of ecosystems includes evaluation of the
habitats and different species, species recovery projects, as well as, neighborhood
conservation to decrease man-animal conflict.
oClimate Resilience: Accommodation of climate change which operates to
improve the capability of the ecosystems for instance the mangrove wetlands and
coral reef, makes them much more competent to handle the vice versa. Its
functions cover the prevention of seashore erosion, and flood control and they
play a role of participating in the regulation of the fish stock from which fishing
enterprises are derived.
Natural Resources
Renewable vs. Non-Renewable Resources
Natural resources are considered fundamental substances procured from nature, which are very
vital to man and his developmental processes. Based on availability and rates of replenishment
they are divided into renewable and nonrenewable sources. They are resources that can be
replenished naturally in say, a year or less given the climatic conditions caring for such resources
will help sustain them in the future. These are Solar energy, wind energy, hydropower and
biomass. For example, one of the renewable energy sources is solar energy and here is how it is
renewable; in the timescale of man. Wind electricity which is produced through the use of wind
power turbines falls under renewable electricity. Hydropower harnesses the energy of flowing
water while biomass is related to the organic matter used to make fuel and energy. Many of these
resources, when properly utilized, offer long-term and cheap sources of energy with minimum
effects on the environment.
On the other hand non-renewable resources are available in limited quantity and take a more
extended period to be recycled at the rate at which they are used. This classification features the
traditional sources of energy known as fossil energy which includes coal, oil as well as natural
gas, metals like iron, and copper, as well as rare earth metals.
Sustainable Resource Management
Sustainable resource management may be referred to as the utilization of the resources within the
lives of one generation while ensuring that they will also be available within the lives of the next
generations. It makes use of environmental, economic, and social factors as the major aspects of
the evolution of long-lasting resource management systems. Principal concepts of resource
management for sustainability involve protection, productivity, and rehabilitation. Conservation
is normally concerned with preserving the resources from being used up more than they are
produced. Efficiency is the process of implementing resources to the highest degree with the
least amount of waste. For instance implementation of renewable energy practices such as using
of light bulbs that utilize energy minimizes the use of fossil energy. Restoration is defined as the
re-establishment of lost ecosystem functionality as well as the enhanced productivity of
resources.
Sustainable resource management covers resource management concepts, circular economy, and
sound policy tools. Integrated resource management combines the management of the physical
resources of land, water and living resources for conservation as well as utilization. The circular
economy also focuses on decreasing, using and recirculating materials to attain their consistent
use instead of discarding them. Policy and regulation are essential in influencing the
implementation and application the sustainable uses of resources. Further, it supports that the
local people are involved in the management of the resources, hence making any practices
culturally viable and acceptable.
Conservation Practices
Conservation management is a breakdown of measures and steps that seek to preserve and
maintain the health of the resource base and natural resources. Thus constituting protected areas
such as the national parks, wildlife reserves and the other regions of similar nature enhances the
conservation of the biodiversity and natural habitats. These areas afford protective habitats for
wildlife and act as conservation belts. Some measures in crop-pest relations such as
intercropping, agroforestry and the use of organic fertilizers increase sustainability and decrease
the harm caused by the soil and chemicals in farming. Conservation of fresh water; practices like
use of drip irrigation and aven use of rain water will be helpful in using the available fresh water
sparingly.
Drip irrigation is a system that waters the plants at the root level and they have very little water
hence conservation of water. Rainwater harvesting means the process of allowing rainwater to be
received and conveyed and used at a later time in an attempt to reduce the usage of groundwater
and surface water. The second one is the energy saving in that there is enhancement of energy
efficiency in the construction, transport and manufacturing sector to reduce the usage of non-
renewable energy resources whose effects on climate consequences are destructive.
Environmental Health
Relationship between Environment and Human Health
The physical surrounding that impacts the health of such people is an area of considerable
magnitude and therefore, should not be underestimated. Environment therefore can be
understood in as much as the face value of a user and his or her context embraces all the aeration,
the water and the soil in which the users exist and impact on their health through various
structures. Besides people need fresh air as well as water which are healthy, and these are some
of the characteristics that make people suffer from innumerable diseases at the slightest
opportunity of breathing polluted air or drinking spoiled water. For example, knowledge
concerning air pollution impacts respiratory health since gaseous airborne pollutants like
particulate matter, O3, and NO2 aggravate asthma and chronic bronchitis. Water in its scientific
representation of H2O is very essential in the fight against diseases; better still water-borne
diseases such as cholera and dysentery. The other area that makes an almost similar contribution
to the general quality of health is built; that comprises of the housing environment, the layout of
the cities, towns or districts as well as the layout of infrastructures. In general, both indoor and
outdoor conditions affect health in the context of poor housing including the shortage of green
areas affects the health of the people. Therefore, the creation and management of a proper
environment remains the key to the enhancement of the status of health in man.
Environmental Hazards
A hazard in the environment is defined as any factor existing in the environment that is capable
of hurting human health. These are for instance; pollution, toxic substances and energies, and
other physical hazards. Another extensive field affecting human well-being was the impact on
the natural environment, and polluted air constituted an essential threat to people’s health
worldwide. Emissions from industries, cars, smog and other airborne hazards are lethal vices that
cause diseases such as respiratory and heart diseases and in severe form lead to death. This
particular water pollution with civil contaminants including heavy metals, pesticides, and
industrial wastes has a direct impact on human health because any ailment that has a medical
solution such as gastrointestinal diseases, reproductive health complications, and neurologic
disorders.
Different and sporadically dangerous materials consist of materials used in industries and
agriculture as well as products that are possibly toxic to health. When chemicals such as lead,
mercury, and pesticides are inhaled, they cause acute poisoning diseases, developmental
disorders, as well as chronic diseases such as cancer. For instance, when exposed to long-term
effects of lead, the result often includes neurological damage in particular to children’s growing
tissues and could bring about bad symptoms in thought process and demeanor. In addition to
physical hazards, some infrastructure hazards are; radiation, heat/cold, and noise which too affect
the health of workers. Extreme noise can cause hearing loss and stress illnesses while extreme
working temperatures cause heat strokes or even hypothermia.
Concerns with Public Health and Methods of Prevention
Species protective measures may entail considerable action because environmental hazards
negatively impact the welfare of the citizens. Air, water and soil pollution harms an individual’s
health in the following ways; respiratory diseases, cardiovascular diseases, cancer and
neurological diseases among others. Another indication of health disparity is extremely
hazardous environmental factors since these primarily affect the nation’s population through
various groups such as children, the elderly, the poor and uninsured, and other minorities.
Methods of control have no equivalent, since the welfare of the public is to be preserved from
deteriorating on account of environmental hazards. Key practices include setting and adhering to
ambient air and water quality standards, among other practices that could help in the fight against
pollution and people’s contact with noxious substances. For instance, assessments that monitor
the quantity of pollutants from factories and automobiles can help increase the quality of air. The
other equally important aspect is the actual raising of awareness among affected populations: this
involves educating people of the harmful consequences activities have on the environment and
discouraging them from engaging in those activities. For instance, it can minimize instances of
polluting the soils as well as the water sources through ineffective disposal of household
chemicals.
Environmental Education and Awareness
Importance of Environmental Education
Environmental education is highly important as it enables citizens and students to develop a
perception of the environment as well as the consequences that come with assumptions human
beings have made about the environment. Environmental studies prepare people with
information, skills as well as disposition that will enable them to make decisions resulting in
responsible actions towards and for the environment. Environmental education enhances higher-
order thinking skills, particularly problem-solving skills due to the capacity it has to get students
to consider consequences of certain environmental circumstances, analyze evidence collected,
and come up with approaches that could be utilized in dealing with the circumstance. It also
imparts an element of responsibility and a business-like attitude towards nature and forces people
to be responsible and act ethically towards the environment.
Strategies to Make People Aware and Encourage Them to Change
Raising consciousness and modification of the populace’s actions involves a complex
educational, community mobilization, and policy framework strategy. Schools and universities
though have a significant responsibility of imparting environmental education and incorporating
it into the lesson plans of all subjects namely; science, geography, social studies and economics.
Practical activities include;going out in the natural environment, and projects in environmental
exploration are useful teaching aids and they attach the students to the subject. Local clean-up
campaigns, tree planting and conservation endeavors act as practices that involve people in
things that can impact the entire community. With the help of various media platforms,
informational campaigns can be conducted and the population can be informed about certain
issues in the environment and certain behaviors should be encouraged. For instance, campaigns
that encourage saving energy, reducing waste, or saving water may trigger major behavioral
changes within the households or communities. Loyalty programs – for instance, bonuses for
bringing your container or receiving discounts for energy-conserving goods also compel people
to embrace sustainable practices.
Media and Advocacy in Encouraging Change and Improper Handling Of the
Environment
A lot of responsibility of informing the masses or concerns within the environment,
campaigning, lobbying and other media functions and advocacy groups are central to
environmentalism. Wayfinding communicates vital information about environmental problems
such as climate change, pollution, and loss of species from the society through news and
documentaries and even through social networks. As for the use of the media to provide details
and real stories of the effects of the discussed issues and possibilities of the related solutions, it
can be stated that the media plays the role of raising awareness and active public involvement.
Environmental journalists can expose incidences of unfair waste disposal and timely expose the
malpractices by corporate organizations or the government. The public interest groups, such as
the NGOs and grass-root organizations organize for support and lobbying of the authorities to
enforce the environmental laws. These groups albeit have a public agenda, and in their
operations engage in activities such as the use of media to pass their messages, planning and
executing campaigns and communication with the community. For example, the campaigns
initiated by Greenpeace and WWF have created awareness coupled with the right action on
issues like deforestation and ocean pollution and endangered species. This was evident even in
the media involvement and encouragement of the public in lobbying for reforms in
environmental conservation.
Global Environmental Challenges
Transboundary Issues
Global issues are those, which are taking place in the environment and cannot be solved without
the aid of different countries. Two examples are worth illustrating: such impacts as depletion of
the ozone layer and ocean acidification.
They also cause depletion of the ozone layer, which is in the stratosphere, protecting life on the
surface of the Earth from the effects of UV radiation. Hence, they include CFCs and other
ozone–depleting substances. UV radiation impacts human beings in the following ways; skin
cancer, and cataracts and weakens the Immune system; impacts marine life fauna, and terrestrial
plant flora and fauna. Within this concern, the scheme called the Montreal Protocol, signed in
1987, has sought to phase out the use of several ODSs and help recover the ozone layer.
Another important transboundary problem is ocean acidification resulting from increased
atmospheric CO2 concentration that dissolves in the seawater and forms carbonic acid. In this
process water in the ocean is also made to turn into an acidic solution by reducing its pH. Ocean
acidification effects affect particularly Prosobranchs, Pelecypods, some zooplankton and
cnidarians such as corals and other organisms whose shells and skeletons contain calcium
carbonate which is a very big problem to marine organisms and the fisheries industry. The
prevention of the impacts of ocean acidification will require similar strategies in regulating CO2
emissions as one of the international measures towards the conservation of the world’s seas.
Topical Initiatives and Partnerships on the Protection of the Environment
While assessing global environmental concerns cooperation should be sought at the international
level. The countries of the world want to contain the rise in the global temperature to as low as
possible, and preferably below the 2 degree Celsius mark of pre-industrial level with aspirations
to reduce it to 1. 5 degrees Celsius. This brings almost all the countries of the Earth together to
agree on cutting the emission of greenhouse gases, building up adaptation, and providing finance
for developing nations.
It is also significant to note that other global activities are the the Convention on Biological
Diversity (CBD) whose goal is the conservation of the biological diversity, the utilization of the
latter’s components in a sustainable manner, and equal sharing of the gains arising out of use of
genetic resources. In addition, United Nations Framework Convention on Climate Change
(UNFCCC) is related to climate change all across the world. It assist in the policies negotiation
and formation in the member countries concerning the impacts of climate change and how to
prevent it.
Science and Technology in Solving Global Problems
Science and technology have central functions in the comprehension of global environmental
phenomenon and their resolution. The socio-economic and political effects of climate change are
studied in detail in their field to predict future climate conditions. Satellite data observing the
Earth’s surface is another type of RS data, which records deforestation rate, rate of melting
glaciers, and changes in land and vegetation cover that are vital in pulling off environmental
management.
New technologies in renewable energy sources like; Solar energy, wind energy and hydropower
energy sources should be enhanced as they replace the fossil-based energy sources. On the same
note and also about this branch of technology, improved crop varieties, the use of biotechnology
also help in improving the sustainability of agriculture by eliciting plants that can withstand
drought and improve the health of the soil. Anti-pollution measures like carbon capture and
storage and pollution control are vital measures that can help reduce the effects of industries on
the environment.
Future Directions in Environmental Science
Emerging Trends and Research Areas
Environmental science remains a dynamic field of study growing more fields and trends in
research on multifaceted concerns. Another critical area of research is the assessment of the
consequences of climate change in some geographical regions or spheres of human activity
including agriculture, water availability, and disease distribution. Studying in this area is focused
on the identification of effective adaptation measures, which must be tailored to specific regions
to enhance the community’s resistance.
One of the more recent areas is the definition of the so-called Anthropocene: a new epoch that
has begun due to the active influence of mankind on the planet’s geology and climate. This area
of study involves the analysis of the level and effects of human interference on systems of the
Earth including effects like urbanization, industrialization and pollution.
Policies and Society Impacts
There are policy implications of the findings of environmental research. Potentials of
Environmental policies are based on scientific findings about the environment social, economic,
and cultural values and trends. The government must develop policies and implement measures
of control on facets like emissions, the use of natural resources, and the conservation of species
diversity.
From the above discussion, it can be deduced that the societal effects of environmental policies
are usually significant. Environment-friendly policies such as renewable portfolio standards, and
energy efficiency can lead to green jobs, lower emission of air pollutants and thereby improve
public health. On the other hand, poorly formulated and implemented policies increase adverse
effects, such as the social-economic consequences of fossil resources depending on communities.
Hence, the evaluation of the Environmental goals should be done in the context of the social and
economic objectives.
Career Place in Environmental Science and Sustainability
The expansion of information on environmental problems and the requirement for effective
techniques to manage those problems have given rise to numerous professional fields related to
environmental science and sustainability. This category's professions are found in government,
academia, NGOs and the private sector.
Subfields in environmental science are jobs like environmental scientists, ecologists,
conservation biologists and environmental engineers. These people and personnel carry out
research on the state of the environment, observe the state of the environment, and find ways to
solve environmental issues that may arise.
Sustainability professionals are mainly responsible for implementing sustainable practices in
organizations and societies. Some positions connected to this study area are sustainability
coordinators, environmental consultants, and corporate sustainability managers. These people
design and executive appropriate measures in an organization to minimize the effects of their
activities on the environment, increase the utilization of resources and embrace the principles of
sustainable development.
