Thinking about the prospects for the United States and the world under a Trump administration, it is clear that regardless of how much of a tyrant he will turn out be in his own country, for the rest of the world it won’t matter. Will he be like Erdogan in Turkey, or even like Hitler? What matters for us is that without the U.S. the fight against climate change is doomed. Nothing new here. But what has come unexpectedly is that oil executives and climate deniers will actually be in power in Washington, not just pulling strings behind the scenes. At a crucial time for action, this is what a Trump tyranny will mean for the other 6 billion of us.