As a government employee, you can't testify against the government.

The climate dice are now loaded. Some seasons still will be cooler than the long-term average, but the perceptive person should notice that the frequency of unusually warm extremes is increasing. It is the extremes that have the most impact on people and other life on the planet.

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

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

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

The democratic process is supposed to be one person one vote, but it turns out that money is talking louder than the votes.

Several times in Earth's history, rapid global warming occurred, apparently spurred by amplifying feedbacks. In each case, more than half of plant and animal species became extinct. New species came into being over tens and hundreds of thousands of years. But these are time scales and generations that we cannot imagine.