This article, and, more interestingly, this podcast give argue that the consequences of Global Warming on species extinction will be modest. The basic argument is that only when populations are unable to migrate north (in the northern hemisphere) because of natural or man-made barriers, will extinctions occur.
The interesting thing is that the author of these views is not a political hack who is a professional climate-change denier, but rather an academic biologist who has been studying the impact of climate change on animal species since 1968. Interestingly, a major tool used by Prof. Botkin has been computer modelling, which he modestly admits is capable of serious errors. Given that so much of the argument for the potential damage to be caused is based around the interpretation of computer models, this warning is very salutary.
