10 May '13, 9pm

Climate hits 400ppm of CO2 for first time in 3 million years

Climate hits 400ppm of CO2 for first time in 3 million years

Humanity is all but certain to zoom past 400 parts per million. The big question is, how far past? For a long time, many climate experts thought we should aim to stabilize atmospheric carbon to about 450 parts per million. That goal looks daunting now. At the current rate, the world will pass that mark within a few decades. Indeed, even the most optimistic analyses of current trends, like this one from the International Energy Agency, which predicts that natural gas will displace coal, see us hitting at least 650 parts per million without drastic changes.

Full article: http://www.treehugger.com/climate-change/what-does-world-...

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For first time, single-day CO2 tops 400 ppm

For first time, single-day CO2 tops 400 ppm

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