Well, sure. And that's really bad for Ice Age evolved macro-species that require a certain survivable temperature and condition to thrive. But you're missing the bigger picture. For lots of plants and bacteria and various insecticidal organisms that thrive in hot, humid environments, this is going to be absolutely amazing.

Yes, humans are absolutely fucked, along with enormous chunks of the mammalian class of species. But life will continue on in exciting new ways.