In 2007, a divided US Supreme Court ruled that the 1970 Clean Air Act granted the US Environmental Protection Agency (EPA) the authority to regulate automobile CO2 emissions. The ruling stemmed from a case brought by a number of states that rejected EPA’s assertion, made during former President George W. Bush’s administration, that the Act did not provide the scope for addressing CO2 emissions. Under the Act, EPA is obligated to address declared pollutants. As former EPA ...

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