The Trump administration has formally proposed ending the Obama-era scientific determination that greenhouse gas emissions endanger public health. The finding is the basis of a 2009 rule that allowed the Environmental Protection Agency to set limits on greenhouse gas pollution from cars, power plants and other sources. On Tuesday, EPA chief Lee Zeldin used an Indianapolis truck dealership as a backdrop as he proposed ending the “endangerment finding,” calling it the “largest deregulatory action in the history of the United States.” The Sierra Club condemned Zeldin’s move, writing, “As if any doubt remained, the Trump Administration has formalized climate denial as the official policy of the United States government.”