In 2009, for example, the Environmental Protection Agency ruled that greenhouse-gas emissions could be regulated under the Clean Air Act. Texasfiled suit against the EPA.

例如2009年，环境保护署规定温室气体的排放应当以清洁空气法为依据，而德州却对此向环保署提起了控诉。

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They say the case for limiting carbon emissions is every bit as strong as it was for lead, or for ozone-depleting chemicals, or other substances that have been regulated by the EPA over the last three decades.

NPR: Supreme Court Hears Global Warming Arguments