Growth über Alles / the race to consume everything we can in our spherical petri dish with the same level of awareness as mindless bacteria, will be the end of human civilisation, regardless of anyone's economic beliefs.
Climate change is simply not an extinction threat. Despite all the fearmongering, the worst case scenarios top out at "WW2" levels of devastation and loss of life.
The only credible extinction threat to humankind so far is an ASI oopise, and that's because it's an intelligent threat.
Assuming positive real return on their investments, a zero growth (or low growth) economy means the rich will own an ever growing proportion of wealth - its simple arithmetic.
Growth über Alles / the race to consume everything we can in our spherical petri dish with the same level of awareness as mindless bacteria, will be the end of human civilisation, regardless of anyone's economic beliefs.