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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Not to be deterred, the president then sought reforms after the U.S. Supreme Court ruled that carbon dioxide could be regulated under the Clean Air Act if the Environmental Protection Agency concluded that it was harmful to human health and the environment.

FORBES: Obama's Sly Attack on Climate Change

Later in 1970, the government passed an expanded Clean Air Act and created the Environmental Protection Agency.

CNN: STORY HIGHLIGHTS

For a decade now, the Environmental Protection Agency has been using a provision of the Clean Air Act to force dirty, older power plants to clean up.

NPR: EPA Proposal Eases Rules on Pollution Controls