Presumptive Republican nominee Donald Trump will speak at the Williston Basin Petroleum conference in Bismarck, N.D., on Thursday, where he’ll emit puffs of carbon dioxide allegedly on the topic of energy policy. In preparation for the speech, Trump has been chatting with energy adviser Rep. Kevin Cramer (R-N.D.) and he’s presumably studying up on OPEC and energy regulations, too.

We’ve collected some of the real estate developer’s past comments on climate and energy to give you some idea of what to expect to hear on Thursday:

On the basic science of climate change: “I am not a great believer in man-made climate change,” Trump told the Washington Post editorial board in March. “If you look, they had global cooling in the 1920s and now they have global warming, although now they don’t know if they have global warming.”