... Environmental groups have long argued that Obama can commit the US to much higher emissions reduction targets and sign a legally binding climate treaty. Kassie Siegel of the Center for Biological Diversity(CBD) told The Nation: "The President already has the authority and in fact a mandate to reduce greenhouse pollution under the Clean Air Act. And to say that he can't come to Copenhagen and commit the US to emissions targets is false. Ninety percent of international agreements are authorized through executive agreements, so it is incorrect to say that his hands are tied by the need for a two-thirds vote in the Senate for ratification." ...
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http://www.thenation.com/blogs/copenhagen/504239/obama_has_authority_to_sign_climate_deal
