You know, a lot of people talk about whether or not global warming is a fact. As far as I know the mjority of scientists have decided that global warming is indeed happening all around us. The real question is whether or not our species is wholly or in part responsible for it. The science isn't in on that part of the question.

But consider this...

If we are part or all of the problem and we do nothing we are condemning our grandchildren to a much more difficult life than we have ever seen. If we are not the problem and we do something we will have made our lives better for the improvement in the efficiency and cleanliness of our toys.

The answer is obvious.

Also, please note that I agree that many times in the past has our planet's climate changed. Each time has resulted in massive extinctions. The human race may indeed survive but we have so damaged the ecosystem that a higher percentage of the living species around us may not make it. That is, a higher percentage than have ever been lost before. At what point does biodiversity go out the window?