2007 Carbon Dioxide Clean Air Act Nitrogen Oxides 
Union of Concerned Scientists
OCTOBER 4, 2023
Shortly thereafter, the Supreme Court ruled that EPA had the authority to regulate carbon dioxide emissions from passenger cars and trucks under Massachusetts v. EPA , and Congress finalized the Energy Independence and Security Act of 2007 , requiring increasing fuel economy standards.
Union of Concerned Scientists
JUNE 14, 2023
The rule, which also applies to new gas plants, would avoid as much as 617 million metric tons of carbon dioxide through 2042, the EPA calculated , the equivalent of the annual emissions of 137 million passenger vehicles—about half of the cars in the country. Those currently operating fossil fuel plants generate 25 percent of U.S.
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