The sad thing about humans is that under capitalism, capital consumes public goods like nature. Then, when those public goods degrade and harm the human species, the capital class that actively consumed those public goods refuses to help restore them and instead cries that it's all a lie

It isn't simply capitalism. What system could handle this with grace? The only solution is world-wide care, which can only be achieved through civilization, education. Using an old-fashioned word: Bildung (https://en.wikipedia.org/wiki/Bildung). That could lead to the moderation required, but social-democracy is dead, and other political ideologies can't deliver. Hedonism triggered by material well-being in the last decades will kill us.

Under socialism ecology did do much better. Maybe it’s not the ism that’s at play here.

Even if we didn't have capitalism, people would still need energy, for everything. It's unfortunate that fossil fuels were the easiest thing to use to generate energy over the last couple of centuries, and that it continues today. Maybe capitalism makes it easy for fossil fuels to remain entrenched, but I doubt any other kind of system would make fossil fuels less pervasive if it were the dominant energy source for over a century.

Capitalism is just a way to manage numbers.

If the true costs were accounted for, Capitalism would work great. The problem is a lot of the costs are left for someone else to eat.