My favourite theory is that the climate crisis is stressful to think about, reducing its impact requires everyone to make sacrifices, and there’s a lack of control over the situation.

People will be inclined to latch on to anyone making an alternative suggestion: it’s a hoax, it will all be fine, the real problem is those people making you make sacrifices. It’s a relief to think that way, because the alternative is harrowing. It’s an easy sell for populists who are willing to say anything to get votes.

See also Covid: it’s easier to think of it as some kind of hoax than parse the true horror of the situation. Someone comes along and says it’s far less bad than the news is reporting, that these solutions aren’t necessary. You don’t need to feel guilty that you want to break isolation, find masking uncomfortable and find the jab unpleasant, because it’s all made up.