A recent report suggests that climate change could eliminate 1 in 6 of the current species on this planet (http://www.theguardian.com/environment/2015/apr/30/one-in-six-of-worlds-species-faces-extinction-due-to-climate-change-study). Pretty obviously, the species most likely to go are a) those that are relatively temperature intolerant b) those that, because of their life-style and/or location, are unable to migrate (laterally or upwards) to curtail the effects of the changed conditions. A mass extinction on this scale would clearly pose serious problems for human populations and this is without even considering the impoverishment of species diversity.
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