Wait till you realise that destroying capitalism necessarily means destroying the environmentally disastrous luxuries that capitalism normalises and encourages.
You think we can just get rid of capitalism and all our capitalist consumption habits would magically be hunky dory? The environment doesn't give a shit about what ideology you have as far as consequences for humanity are concerned, it gives a shit about whether you're exceeding the limits of what the system can sustain. Animal agriculture will be just as inefficient, wasteful and unsustainable under any ideology (and just as intrinsically cruel under any ideology), the most a smarter ideology than capitalism can hope to do is recognise that fact and identify it as something we should stop doing.