hopefully nature will save us.
Nature will save us? You mean, like it took care of the dinosaurs "for us"?
Oi.
I doubt "nature" gives a rat's ass about us, our environment, global warming, or the cause of it, human or otherwise. In the end, we will either adapt to conditions as they develop or become extinct ourselves. We could do something about it (though we should have started thirty years ago), but most likely we won't. Things are probably going to become very difficult for humans (and most life on the planet) in the future, either gradually or abruptly.
And THAT will be nature for ya.