Conventional thinking is that the auto industry, wanting to sell more fuel-gulping SUVs, are pushing for weaker fuel economy standards, but Hiroko Tabuchi, climate reporter for The New York Times, exposes Big Oil's stealth campaign.
Both are problems, but globally, sports utility vehicles sales are proliferating far faster than cars, be they electric or petrol-powered, posing a major challenge for governments committed to reducing greenhouse gas emissions.
States and cities are reacting to President Trump's withdrawal from the Paris Climate Agreement on Thursday. Three states formed the U.S. Climate Alliance; by Monday, it had grown to 13. Initially 30 mayors signed in support; it's now over 200.
A legal battle is looming between the nation's two most powerful environmental regulators after the California Air Resources Board on Friday defied President Trump by approving vehicle fuel efficiency standards that Trump has promised to ease.