We don't know exactly where all the tipping points are in the physical world for inescapable damage, but we're clearly reaching close to some of them.

Climate change is the single biggest thing that humans have ever done on this planet. The one thing that needs to be bigger is our movement to stop it.

The technology we need most badly is the technology of community, the knowledge about how to cooperate to get things done.

Very few people on earth ever get to say: 'I am doing, right now, the most important thing I could possibly be doing.' If you'll join this fight that's what you'll get to say

what you do every day is what forms your mind and precious few of us can or would spend most days outdoors.

In 50 years, no one will care about the fiscal cliff or the Euro crisis. They'll just ask, "So the Arctic melted, and then what did you do?"

Global warming is no longer a philosophical threat, no longer a future threat, no longer a threat at all. It's our reality.

Advent: the time to listen for footsteps - you can't hear footsteps when you're running yourself.

We've been given a warning by science, and a wake-up call by nature; it is up to us now to heed them.

The real negotiation is between humans on the one hand and chemistry and physics on the other. And chemistry and physics, unfortunately, don't bargain.

We can either save the planet from catastrophic warming, or protect fossil fuel CEOs. Not both. Do the math(s)

[On one of his comrades depicted in the book:]"Sasha was my friend … Like me, he was 19. But he didn't come home. He was killed 12 hours after this photo was taken.

As a dinner guest I gratefully eat just about anything that's set before me, because graciousness among friends is dearer to me than any other agenda.

The virtue of some people consists wholly in condemning the vices in others.

I don't expect anyone to give me anything.

French people are Italian people in a bad mood.

It's hard work to make a four-minute program look effortless and elegant.

Without civilization, we would not turn into animals, but vegetables.

Giving honest and well-intended feedback is often confused with being mean. It's not mean; it's nice.

It's pretty damning. That's Hillary Clinton juxtaposed against the FBI Director Comey yesterday, clearly illustrating she lied.

The thing about film-making is I give it everything, that's why I work so hard. I always tell young actors to take charge. It's not that hard. Sign your own cheques, be responsible.