| http://www.w3.org/ns/prov#value | - In 2007, pushed by certain state governments that had already grown concerned about climate change, the U.S. Supreme Court opened the door to federal regulatory action with its 5-4 ruling in Massachusetts v. EPA.2 In that decision, the court ruled that carbon dioxide and other greenhouse gases are, ???without a doubt,??? ???air pollutants??? within the meaning of the Clean Air Act and that (absent
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