I've learned the importance of changing people's minds at the grassroots level so that whoever does run will have a much better chance of encountering public opinion that reaches a critical mass and brings about a change not only in White House policies but in the Congress and in the state legislatures and all around the world.

The catastrophe now threatening us is unprecedented - and we often confuse the unprecedented with the improbable.

We need to remake the Democratic party. We need to remake America.

Any of us who work on the task of solving the climate crisis have at times an internal struggle between hope and despair. But that's one of the things that connects this climate movement to the previous great moral revolutions, like the civil rights movement and more recently the gay rights movement. So those who feel despair should be of good cheer, as the Bible says. Have faith, have hope. We are going to win this.

It should be lifted above partisanship because it's a question of survival. It's a moral issue.

The truth about the climate crisis is still inconvenient for the large carbon polluters and the politicians who are in their pockets.

Our way of life is at stake, our grandchildren are at stake, the future of civilization is at stake.