http://www.nytimes.com/2009/03/24/science/earth/24epa.html?scp=1&sq=clean%20air&st=cse
KATE GALBRAITH and FELICITY BARRINGER
Published: March 23, 2009
The Environmental Protection Agency, about to declare heat-trapping gases to be dangerous pollutants, has embarked on one of the most ambitious regulatory challenges in history.
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Global Warming takes place due to the accumulation of gases in the atmosphere. These gases trap the heat not allowing it to leave to the upper atmosphere.
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