Morning traffic fills a freeway in Los Angeles. Seventeen automakers signed a letter to the Trump administration and California Gov. Gavin Newsom saying they want one set of policies to reduce greenhouse gases and make cars more fuel efficient.

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Morning traffic fills a freeway in Los Angeles. Seventeen automakers signed a letter to the Trump administration and California Gov. Gavin Newsom saying they want one set of policies to reduce greenhouse gases and make cars more fuel efficien