I mean, it's not a hard conspiracy theory to fabricate that space-focused billionaires like Elmo and Butthead would want Earth to become increasingly uninhabitable to justify more outside investment in their "solutions" of space race-ing to Mars or colonies that they can then rule over.

It's a conspiracy theory, but the best ones are always rooted in some morsel of truth (Elon/Bezos wanting more investment in their space firms).