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For automakers, California emissions standards play a key regulatory role
Car manufacturers want a clear vision of where the country is headed, to create a consistent production process.
GM makes U-turn in Trump's fight over California emissions
GM had previously sided with the Trump administration in a legal fight over California setting its own emissions standards.
American transportation is a major pollutant. See exactly where it's coming from.
Journalists and researchers have teamed up to map emissions from transportation around the United States.
Why Trump’s looser emission standards are mixed blessing for automakers
13 states are challenging the proposal.