Bad initial assumption: That the planet, which has been here for 2200 times as long as the line of humans, needs any saving from a bunch of upstarts.
With or without us, the planet will still be here, albeit with some changes (gee, just like the past), at least until the sun goes nova or something really big runs into it, neither of which humans could do one damned thing to prevent.
This is as stupid as all those people from hot climates wanting us to freeze to death in electric vehicles up here to make the planet cooler.
Send those pinheads up here for a winter, and we'll cure them, at least the ones who survive it.