I think the crucial tipping points were passed around 1990. The habitable zone will probably shrink dramatically in the next 100 years (with confidence around 80%), and we may even go extinct (confidence 10%). We should put considerable resources into post-apocalyptic science.
I don't see how not accepting the possibility that we are effed helps. But it often makes sense to put all of one's resources on a small possibility, especially if others don't. (I am very concerned that almost nobody plans for the worst case, though.)
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The fact that euthanasia is illegal in most countries tells us that people tend to be in denial about things that make them uncomfortable, even if it means most of them will die horribly as a result of looking away.
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