Earlier quoted context omitted.
> We don't save the earth for the earth. We save it for ourselves. I was hoping that we were trying to save it (from us!) because this is simply the right thing to do.
Not trying to be the least bit facetious: What makes it the right thing to do?
What says that we have more right to liver here, take the air, water and other resources than any of the other clearly sentient & intelligent beings among whom we live?
I have a hard time finding any good answers to that question that do not boil down to , i.e., we're more intelligent, capable, etc., so screw all the other animals and plants (upon which, BTW, our continued existence depends).
So, from an ethical POV, mere consideration of the other beings makes it hge right thing to do.
Even if we want to save it for only ourselves, we need to wise up damn fast. Look at the list starting with AGW shifting the climate faster than any time since the asteroid 65MM yrs ago (& now showing serious signs of runaway feed-forward effects), plastic debris and microplastics choking the food chain on sea and land, neonicotinid pesticides destroying the insect population & especially pollinators at well into double digit levels, monoculture industrial agriculture, massive habitat destruction... the list goes on and on. The result is that we are likely getting dangerously close to breaking the food web. When that happens (even without war) there will only be a few survivors, if any, and they likely not consider themselves lucky.
So, even if only for selfish motives, merely acting like it is right to preserve the earth's biosphere, is the right thing to do.