Discussion about Environmental challenges

Discussion about Environmental challenges

Please find an article that discusses some environmental challenge that we as a society are facing in this century and summarize and discuss the article in a short write-up (1-2 pages). 

NASA Satellite Data Show 30% Air Pollution Drop over the Northeastern US
https://climate.nasa.gov/news/2970/nasa-satellite-data-show-30-air-pollution-drop-over-the-northeastern-us/

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word limit: 510