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To Avoid Catastrophic Effects, World Emissions Have To Be Negative After 2050?

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To avoid the most catastrophic effects of climate change, world carbon emissions will have to drop to near zero by 2050 and "go negative" after that, the Worldwatch Institute reported on Tuesday.

This is a deeper cut than called for by most climate experts and policymakers, including President-elect Barack Obama, who favors an 80 percent drop in U.S. carbon emissions by mid-century.

Limiting carbon emissions aims to keep global mean temperature from rising more than 3.6 degrees F (2 degrees C) over what it was before the Industrial Revolution -- but one Worldwatch author said even this is too dangerous.

Read the whole story at Reuters AlertNet

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