Global warming may wipe out the human species and most other living things, but new organisms will probably take their place. Or not--life on Earth is actually much more tenuous than people think and is the result of a series of fortunate circumstances. But if all life on Earth, and any other life in the Universe somes to an end, what does it matter? Is there an intrinsic value to life over say rock or clouds of dark matter? In the cosmic scheme of things it doesn't matter.
OTOH I would prefer to live out my life and have my kids and my one grandkid be able to have enjoyable or at least tolerable lives and leave the cosmic thinking to the Zen masters.
Much as I like what Rasputin (the maggot, not the monk) says, I don't think a change in the human pxyche is forthcoming or that disastrous climate change can be accomplished by individual altruism. I fear it is not possible in a democratic society or without pain more serious than most of us would submit to voluntarily.