With Latest Rollback, the U.S. Essentially Has No Clean-Car Rules

The momentous end to the federal government's legal authority to fight climate change makes it official.

The United States will essentially have no laws on the books that enforce how efficient America's passenger cars and trucks should be.

That's the practical result of the Trump administration's yearlong parade of regulatory rollbacks, capped on Thursday by its killing of the "endangerment finding," the scientific determination that required the Environmental Protection Agency to regulate greenhouse gases because of the threat to human health.