400 Parts Per What? and Why You Should Care
May 2nd, 2013 | By admin
By Suzanne York, www.howmany.org At some point in early May, the amount of carbon dioxide (CO2) in the atmosphere is expected to hit 400 parts per million (ppm). It will fluctuate throughout the rest of the year, and for the next several years. It is predicted to stabilize at the 400ppm mark by 2017, and
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