My father had a mid-life crisis in the mid-90s and went from being an apocalyptic end-times Christian to being an apocalyptic environmentalist.
The dress, fashion, and lingo of the nutbags that hung out at my house changed, but their personality characteristics and complete inability to engage in multivariate analysis of reality was identical.
Radical ideologues and radical religious fundamentalists are, for me, 2 sides of the same coin. And both have a tendency to turn the movements they claim to represent into caricatures of themselves.
Apocalyptic environmentalists have moved beyond a certainty of the problem of climate change to a certainty on THE ONE AND ONLY SOLUTION, which is a radical reduction in standard of living in the industrialized world being the answer.
My father was never able to do anything beyond simple algebra. He thinks in terms of stories and narratives. He won't listen to my brother or myself when we try to actually talk to him about numbers and reality and whatnot, saying we are too young to know anything. But minutes later in the same conversation, he will start talking about how wonderful Greta Thunberg is. For him, it's all emotion and feeling and "doing something".
It's fucking unbearable, and my siblings and I are at a point where we avoid visiting him at his home, because he just won't stop parroting deranged talking points. His friends will frequently be there, and the constant one-upping of them with various moral posturing is nauseating.