Global warming: What does the future hold?

Tonight I watched part of a program on global warming on public television. The program tried to leave viewers with no doubt that global warming is and will continue to cause major problems for the future of the planet and humankind. One question I was left with, however, was whether there are any positive consequences of a warming globe. There's no doubt global warming will have serious consequences, but the producers seemed to have to stretch to show some of those consequences (others are very evident and worrisome). This no doubt will be a major discussion point for the years to come.