Burning all the fossil fuels will destroy the planet we know, Creation, the planet of stable climate in which civilization developed.

It has become very difficult for anyone to argue that observed global warming is natural variability. We have good reason for being able to say that the world will be warmer by about a quarter of a degree in the next decade. It's the same reason we had 10 years ago when we said that the 1990s would be warmer than the 1980s: The planet is out of equilibrium.

...the global surface albedo [surface whiteness] and greenhouse gas changes account for practically the entire global climate change.

...99 percent confident that the world really was getting warmer and that there was a high degree of probability that it was due to human-made greenhouse gases.

The question is not whether to close the parks, but how to accomplish this goal.

Money has too big an influence on our politics in Washington and somehow we need to do something about that.

The greatest danger hanging over our children and grandchildren is initiation of changes that will be irreversible on any time scale that humans can imagine.