There are many who would much prefer that the word 'climate' never be mentioned and that the issue be eliminated from our national conversation.

The gay rights movement of recent years has been an inspiring victory for humanity and it is in the tradition of the civil rights movement when I was a young boy in the South, the women's suffrage movement when my mother was a young woman in Tennessee, the abolition movement much farther back, and the anti-apartheid movement when I was in the House of Representatives. All of these movements have one thing in common: the opposition to progress was rooted in an outdated understanding of morality.

My counsel advises me that there is no controlling legal authority or case that says there was any violation of law whatsoever.

Believe in the power of your own voice. The more noise you make, the more accountability you demand from your leaders, the more our world will change for the better.

There's no such thing as clean coal. It's non-existent. Theoretically, it might be possible, many years from now, to come up with a way to clean it as it's burnt. But there's not a single demonstration project in the United States. [...] Clean coal doesn't exist.

In physics there's the old law for every action there's a equal amount of reaction. Sometimes that's true in politics. If somebody's out there making nonsensical statements, but wielding power behind them a lot of people say, "Well, I need to react to that." Another reason for the increased prominence of the climate-change issue is the Paris Agreement itself. It's not a small thing when just about every nation in the entire world comes together and makes an historic agreement like this. It's a big deal. And the old cliché "The train is leaving the station" kind of applies.

We ought to approach this challenge [of global warming] with a sense of profound joy and gratitude: that we are the generation about which, a thousand years from now, philharmonic orchestras and poets and singers will celebrate by saying, they were the ones that found it within themselves to solve this crisis and lay the basis for a bright and optimistic human future.