The Greenhouse Gas Endangerment Finding, issued in 2009, has been upheld by every administration since and forms the legal basis for the federal government to regulate greenhouse gases. The Endangerment Finding is simple, but crucial. But revoking the Endangerment Finding is a dramatic escalation of the Trump administration’s war on climate action. In undoing the finding, the EPA is not only lying to the public about the fossil fuel industry’s responsibility for the climate crisis. Zeldin and the EPA would do well to think of these four worlds today, for to repeal the Endangerment Finding is to violate each of them.