That isn't the point, is not true, and is ultimately meaningless becuase if you mean the universe will carry on, then yes of course it will.

You’re most definitely right in the grand scheme of things. I’m not so sure that’s what people are referring to when they want to “save the planet”.

Humans aren't in any danger of going extinct, either.

Exactly, many hundreds of millions will just suffer immeasurably and see horrible and painful deaths.