There's a better scientific consensus on this than on any issue I know - except maybe Newton's second law of dynamics. . . Man has reached the point where his impact on the climate can be as significant as nature's.
When you're a kid, you think, "Well, I will grow up and I will get a wife and we will have kids and then we will have grandkids. " My life has a different shape. That is weird, but there are things about it that are exciting.