Some Democrats deserve to be criticized.

It would be immoral to leave young people with a climate system spiraling out of control.

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

Coal is the single greatest threat to civilization and all life on our planet.

The urgency derives from the nearness of climate tipping points.

In view of the immense power of natural weather and climate fluctuations and the great buffering capacity of the Earth, especially the ocean, it is easy to be skeptical about whether small anthropogenic changes of atmospheric composition can have important practical impacts.

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.