Remember when the term “polar vortex” went viral?

It was January of 2014, and parts of the U.S. were colder than Mars. In Minnesota, temperatures reached negative 35 degrees, and in Texas it was 21. Overall, more than a third of the country experienced below-zero temperatures, and every single state dipped below-freezing—even Hawaii. At least 21 people died from the cold.

Climate deniers thought this was all pretty funny. “Al Gore told me this wouldn’t happen,” Senator Ted Cruz chuckled. A genius, that guy. On Drudge, the banner headline screamed: “‘GLOBAL WARMING’ INTENSIFIES.”

Donald Trump, then just a reality show host with a Twitter account, did not mince words: “This very expensive GLOBAL WARMING bullshit has got to stop.” (This was the day he truly became president.)