Not to say that climate change isn't a very serious issue, but we will likely have to live with the realities of where we are headed, and life has adapted in the past to much larger swings of temperature.
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.