President Obama is staking part of his legacy on a big risk: that he can substantially reduce greenhouse gas emissions by stretching the intent of a law decades old. Follow this link:  News Analysis: Clean Air Act, Reinterpreted, Would Focus on Flexibility and State-Level Efforts ; ;Related ArticlesOp-Ed Contributors: Bittersweet Achievement on ClimateDot Earth Blog: Obama’s Ambitious Global Warming Action PlanObama Outlines Ambitious Plan to Cut Greenhouse Gases ;

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News Analysis: Clean Air Act, Reinterpreted, Would Focus on Flexibility and State-Level Efforts