Pollution: It's affecting us drastically. It's not only urban pollution. There are many factors ; scientists are mainly concerned about co2 emissions and methane. Coal ; and vehicle for co2 and animals produce methane. Many other problems but these cause changes in the atmosphere and global warming. http://www.climatecentral.org/news/u.s.-greenhouse-emissions-fall-but-methane-complicates-picture-16642.
Answered 1/22/2016
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