The climate system is being pushed hard enough that change will become obvious to the man in the street in the next decade.

It's as certain that as long as fossil fuels are the cheapest energy, we will just keep burning them.

The trains carrying coal to power plants are death trains. Coal-fired power plants are factories of death.

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

What has become clear from the science is that we cannot burn all of the fossil fuels without creating a very different planet.

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.

We have at most ten years—not ten years to decide upon action, but ten years to alter fundamentally the trajectory of global greenhouse emissions.