I would say that the ultimate impact on Mankind of Climate Change is itself outside the scope of Climatology by itself - by its own nature it would be an interdisciplinary effort involving at the very least Climatologists, Sociologists and Economists.

That said, anybody can, as non-expert, mention some possibilities, though obviously not claiming any authoritativeness on the subject. (That's what I tried to do, hence why I began by saying it was just my "hazarding").