“We have to get our states to adopt what are called “renewable portfolio standards” pledging to use a lot of renewable energy by 2015 or 2020. We have to work with businesses and shops to get them engaged in the same way.”

We’re going to need that kind of movement, because the fossil fuel industry is a sprawling adversary – at work everywhere, its tentacles in everybody’s politics, invulnerable, I think, to direct frontal assault, but probably more brittle than it guesses if we come at it from all sides.

Especially in recent years, the more and more we understand what we are doing, the more we have the science to tell us what we’re doing, the fact that we continue to do it without taking steps to address it strikes me as, among many other things, irreverent in an extreme.

Ice in the West Antarctic and over Greenland, i.e., ice that’s over a rock at the moment, that will raise the level of the sea as it slides into the ocean, putting at risk everyone and everything that lives on the coasts, and that includes an enormous percentage of the world’s people.

We have built a greenhouse, a human greenhouse, where once there bloomed a sweet and wild garden.

Everything that the administration has done has been counterproductive.

My guess is that liberating the fossil fuel industry to frack anywhere they want will drive down the rate at which we’re converting to sun and wind. And it’s entirely a rate problem at this point.

Renewable energy is far more labor-intensive than fossil fuel production.

But tolerance by itself can be a cover for moral laziness.

I’m probably the wrong person to ask. My partner in much of this work [climate movement], who really came up with the divestment campaign with me, Naomi Klein, I think has written powerfully about this.

[Barack Obama] done some good things, he’s done a couple of bad things. He’s obsessed with this all of the above energy policy and… lots and lots of drilling in the States, so he’s been weak on it.

What makes us different? We’re the creature that can decide not to do something that we are capable of doing.

Probably more than anything else, the place that we really see the effects of the power of even the relatively mild temperature increases so far is in the melting of everything frozen on the planet.

The movers and shakers on our planet, aren’t the billionaires and generals, they are the incredible numbers of people around the world filled with love for neighbor and for the earth who are resisting, remaking, restoring, renewing and revitalising.

If you were running a solar company you may be okay – you may be able to keep growing. The question for physics is: Can you grow fast enough to begin to catch up with the damage?

I think we need to think of lots of ways to communicate. And we tried some at 350. We organised what they called the largest art project in the planet’s history. We do a lot with art and music and things.

We’ve been in lots of places that I suppose, by Oxford standards, would be considered illiterate, but everyone’s completely conversant with the idea that here is a number, and that number is above it, and that’s too high. It’s not a very complicated idea.

It’s no use crying over spilt milk, because all of the forces of the universe were bent on spilling it.

I get a little nauseated, perhaps, when I hear the phrase ‘freedom of the press’ used as freely as it is, knowing that a large part of our proprietorial press is not free at all.

Colombia is not how people think it is. We used to eat fish every Sunday at the beach. In the town where I grew up, people did not tell lies.

They used to say that knowledge is power. I used to think so, but I know now they mean money.

Please use your freedom to promote ours.

I endorse only products I actually use. Like Wheaties keeps offering me money, but I don’t eat Wheaties, so I can’t do it. Now, if Rice Krispies or Frosted Flakes offered me a deal, I’d take it right away. Apple Jacks, I’d be on the box in a heartbeat. Apple Shaqs. Yeah.

Writers know words are their way towards truth and freedom, and so they use them with care, with thought, with fear, with delight.

The chief virtue that language can have is clearness, and nothing detracts from it so much as the use of unfamiliar words.