Now is not the time to shrink from the challenge of saving our only home in the universe. Now is not the time to pull into ourselves, retreating into either survivalist or escapist mode. To the contrary, this is the time for titans, not turtles. Now is the time to open our arms, expand our horizons, and dream big. Big problems require big solutions.

If [Donald] Trump throws 20 million off of health care, that's going to be - if he handles this badly - and it's very hard to handle it right, then that's a - a huge advantage in the mid-terms for us.

I think there's going to be a tug of war in this country over who are the real patriots because at a time of national crisis, economic collapse and calamity, ecological peril and social dislocation, the American people deserve to be a partner to the American government.

There would be a cost for dumping carbon into our atmosphere and a cap on total emissions. The government must make a clear and firm decision - terminating the idea in our society it is free to pump infinite amounts of carbon into the air. Once that happens, private capital will flow even more aggressively into developing and deploying the alternative, less-polluting technologies.

I do feel kind of like I have a split identity in that there's Van Jones, who has this big public role and tries to inspire millions of people to do new stuff together. And then there's just me: a pretty quiet, shy, retiring person.

The government also has to get the public rules right. That means putting a price on carbon, so the cleaner forms of energy become more competitive. As soon as that happens, a tidal wave of new capital, innovation and entrepreneurship will flood into the clean energy space - creating new jobs and opportunities for Americans of all walks of life. We did that for the internet, with public investments in the basic system through the Pentagon, followed by rules that encouraged innovation and competition. And that is why the internet took off in the United States first.

If we do nothing, the ensuing climate catastrophe will wreck our economy - including wreaking havoc on our food production systems. All credible scientists agree on this point.