Almost every human civilization is extremely environmentally damaging in some way. Much of the global North would be uninhabitable without heating for a proportion of the year.

Limiting ourselves to places we can occupy (and actually work/produce) year round without environmental control would mean basically killing off a significant chunk of the planet's population and telling loads of whoever is left that they need to leave behind their homes and move.

Compared to eating less meat, that seems to be a much bigger ask.