> Except that the planet has been warming and cooling for millions of years. This does not invalidate calling it "global warming". Just because it's happened b

> Except that the planet has been warming and cooling for millions of years. This does not invalidate calling it "global warming". Just because it's happened before doesn't mean it's not happening now. When you hit the gas, do you restrict yourself from saying that the car's speed is increasing just because it's increased before?