evidence: The reasoning behind those actions has been hard to pin down. Trump has repeatedly denounced global warming as a "hoax" and a Chinese plot to undermine U.S. manufacturing. But then, in a January 2019 press conference, Trump also said "nothing’s a hoax" about climate change. Many of those he had named to head various agencies, including Rick Perry at the Department of Energy and Scott Pruitt at the Environmental Protection Agency, questioned or denied the role of carbon dioxide in climate change. But when reporters have directly asked whether Trump believes global warming is real, White House press secretaries have skirted the question. It’s hard to tell whether his administration is skeptical about the scientific fact of the climate crisis or simply the urgency of doing anything about it. [...] CLAIM 2: The alleged "hockey stick" graph of temperatures over the past 1,600 years has been disproved. It doesn’t even acknowledge the existence of a "medieval warm period" around a.d. 1000 that was hotter than today is. Therefore, global warming is a myth. [...] Yet that rarely occurs. In 2004 historian of science Naomi Oreskes published a landmark analysis of the peer-reviewed literature on global warming, "The Scientific Consensus on Climate Change." Out of 928 papers whose abstracts she surveyed, she wrote, 75 percent explicitly or implicitly supported anthropogenic global warming, 25 percent were methodological or otherwise took no position on the subject—and none argued for purely natural explanations. Notwithstanding some attempts to debunk Oreskes’s findings that eventually fell apart, her conclusion stands.