We are certainly in the midst of one of the most major extinctions of life on this planet, and at the rate it's going now, we will soon become, I believe, the most important extinction event.
I have to say that I am not a climate scientist, but the experts who I have consulted on this issue are not very optimistic about us being easily able to reverse the effects on global climate. The CFC issue was relatively easy in terms of protecting the ozone layer and reversing the ozone hole. I hope that scientists will figure out a way to return temperatures to their pre-human activity levels. I don't see how it's going to happen. I think that even in the best-case scenarios we're looking at very large temperature increases, increasing variability in temperature, increasing storm activity, and increasing typhoons. These are going to devastate both the human populations and the natural communities that surround us. I wish I had that answer.