In a couple hundred million years the Earth will regenerate, new species will evolve, etc.
I do think we have a responsibility as self-aware beings to pick up after ourselves, but at the same time the Earth will be fine long-term. You could even say it's fine now. Yes, species are going extinct at an alarming rate, but we came from the Earth too and are not the only contributing factors to Earth's various disasters. I'm not about to throw trash out the window because of that fact, it's just that I don't have so much anxiety about totally destroying the planet. Maybe we will destroy the planet inasmuch as we can't live on it anymore, but that's our own damn fault and it's almost nothing compared to the longevity of the Earth.
