"Life" will adapt. Ecosystems won't. It really sounds like you're expressing your feelings about a likely mass extinction event as "shit happens, what're you gonna do?"
I don't know where you're going with this. No, that's wrong, they are separate concepts. There was "life" 320M years ago just like there is today. But the carboniferous forest mats that we saw then spanned the globe, with trees growing on tens of millions of years of their undecomposed ancestors. It was an entirely different environment, and we'll never see it again now that bacteria evolved the ability to digest lignin.
Closer to home, there is "life" on the deep ocean floor today. And most of it has evolved to exploit the oxygenated water of the environment, which is fed by an arctic downwelling off of Greenland (yes, all deep ocean water is fed from a "spigot" in just one place).
Well, guess what, with the reduction in ice cover over the last decade or so and the increases in temperature expected to accelerate that process, that downwelling is collapsing. All those ocean floor ecosystems are going extinct within the next thousand years, and it's probably too late to save them.
