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The amount of carbon dioxide (CO2) in the atmosphere today is roughly 390 parts per million (ppm), well above the 275 ppm it was before we started pumping pollution skyward during the Industrial Revolution. Climate scientists and green leaders today agree that 350 ppm would be a tolerable upper limit.

EarthTalk: Atmospheric CO2 – Is it Too Late Anyway?

EarthTalk® is a weekly environmental column made available to our readers from the editors of E/The Environmental Magazine Dear EarthTalk: I read that CO2 in our atmosphere is now more than 300 parts per million. Doesn’t this mean that we’re too late to avoid the worst impacts of climate change?  — Karl Bren, Richmond, VA Actually the amount of carbon…

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