But life had up to now evolved to function at a sustainable level.
It can't go on forever indeed there's a thing called the heat death of the universe, but it is sufficiently far in the future that I don't care about it.
The shit that happens now means that my kids won't be able to have children in good conscience (I already feel sorry for them for the mess I put them in).
Life is a dissipative system too. It consumes energy and generates entropy. This can’t go on forever, but I wouldn’t take that as an argument against life.