Marathon, the country’s largest oil refiner, has backed the Trump administration proposal to roll back car efficiency standards. Erin Kirkland for The New York Times Want climate news in your inbox? Sign up here for Climate Fwd: , our email newsletter. When the Trump administration laid out a plan this year that would eventually allow cars to emit more pollution, automakers, the obvious winners from the proposal, balked. The changes, they said, went too far even for them. But it turns out that there was a hidden beneficiary of the plan that was pushing for the changes all along: the nation’s oil industry. In Congress, on Facebook and in statehouses nationwide, Marathon Petroleum, the country’s largest refiner, worked with powerful oil-industry groups and a conservative policy network financed by the billionaire industrialist Charles G. Koch to run a stealth campaign to roll back car emissions standards, a New York […]