climate and air pollution question

As increases in human population lead to expansive industrialization and cultivation, increased carbon emissions are resulting in global climate change. This atmospheric alteration may result in a number of detrimental environmental impacts including food insecurity, increased spread of disease, more intense storms, and sea level rise. As the United States is one of the largest contributors to atmospheric carbon emissions, describe one or two specific new policies might the United States enact to reduce its impact on global climate change. Be creative here; focus on policies that are not already in place.  Discuss the economic impacts of any proposed policy.