They'll just move to the most inhabitable, least affected, parts of earth. Perhaps New Zealand, Argentina or Scotland.

They don't need bunkers. This is what the billion dollar yachts, private planes and multiple homes in many jurisdictions are for.

Anyway, I don't think it's fair to blame only the rich. We live in democracies with free speech and accessible information.

I know a lot of anti-nuclear activists and those people are not rich, but are definitely more guilty of causing catastrophic climate change than the millionaires and billionaires.

Every advanced country could have achieved the 5 tons per capita that France and Sweden achieved in 1990 by using nuclear energy. And that would have solved most of the climate change problem. The reason it is so bad now, is because we squandered the past 35 years and increased our emissions instead of reducing them.