short essay help

Question: the most contentious issue in america these last 25 years about climate change has been whether or not it's caused by human beings or "other" unrelated factors. Describe as fully as you can Ramanathan's experiment called INDOX and how he answered that question.

Required:

1. this short essay must be no longer than 250 words

2. below the short essay,use not more than 4 sentences to write a summary of your essay.

3. Finished before 2.26 21:00 (pacific standrard time)