There is no real scientific debate over what is happening; of course there is debate over exactly how it is going to play out in the decades ahead, because this is a large experiment that we haven't done before, and no one knows precisely how one can ever precisely predict what effects this heat will have. But all the science in the last few years, or almost all of it, really serves to show that the effects are larger and more rapid than we had thought even a decade ago.

We're not at the point of trying to stop global warming; it's too late for that. We're trying to keep it from becoming a complete and utter calamity

The real negotiation is between humans on the one hand and chemistry and physics on the other. And chemistry and physics, unfortunately, don't bargain.

We have assumed control where once we worked with what we were given.

I'm not sure I'm a very good source of advice since we're kind of making this up as we go along.

When we think about global warming at all, the arguments tend to be ideological, theological and economic.

We've been given a warning by science, and a wake-up call by nature; it is up to us now to heed them.