That doesn't really address the question, though. Even if this can't be solved with individual contributions, it's still likely that any societal changes we cou

That doesn't really address the question, though. Even if this can't be solved with individual contributions, it's still likely that any societal changes we could make would have enormous impacts on our lifestyles. Think "cutting meat production/air travel/personal automobiles/etc by 95%". That's what OP is calling "Malthusian doomerism" — saying we need to instead look for solutions that don't involve drastic measures. Except there's not really evidence that such solutions actually exist.