400 Parts Per Million

Image: Former Vice President Al Gore. (photo: Mario Anzuoni)

readersupportednews.org - May 11th, 2013 - Al Gore

Yesterday, for the first time in human history, concentrations of carbon dioxide, the primary global warming pollutant, hit 400 parts per million in our planet's atmosphere. This number is a reminder that for the last 150 years -- and especially over the last several decades -- we have been recklessly polluting the protective sheath of atmosphere that surrounds the Earth and protects the conditions that have fostered the flourishing of our civilization. We are altering the composition of our atmosphere at an unprecedented rate.

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