Economies can exist in many different ways. At its core it is just a way to describe how we move resources between ourselves and that can be done in many, many ways.
Wrong question if you actually like capitalism or value keeping it going. The question should be how to make the necessary reforms to capitalism to not have people try to attempt "the other ways" you're going to try to debate. The problem, it seems, is that Capitalists can't fathom a world where they might be prevented from doing maximum extraction.
I know what I'd be using those billions for!! To virtue signal like hell that I was the most nature conservationist billionaire in existence. Not "how can I say this is conservation and monetize it", real conservation with true stewardship of the land. But also that thinking is probably why I'm not a billionaire.
Non-capitalist economies don't really have a better record on environmental protection. It's almost like the problem is human nature, not the specific economic system.
It seems it may be 'animal nature'. We maximize our benefit until the environment limits us, and humans have become 'too good' at it, increasing stakes to a global scale.
Economies can exist in many different ways. At its core it is just a way to describe how we move resources between ourselves and that can be done in many, many ways.