everyone knows, at some level, that the sharp line between "good weather" and "bad weather" is a fiction, that we need rain as surely as we need sun.

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)

You don't hurt 'em if you don't hit 'em.

World War I was not inevitable, as many historians say. It could have been avoided, and it was a diplomatically botched negotiation.

When a language creates - as it does - a community within the present, it does so only by courtesy of a community between the present and the past.

Three things cannot long be hidden: the sun, the moon, and the truth.

A dead enemy is a joy forever

The most important thing for any aspiring writer, is to read! And not just the sort of thing you're trying to write, be that fantasy, SF, comic books, whatever. You need to read everything.

Orwell is almost our litmus test. Some of his satirical writing looks like reality these days.

Nature has endowed each of us with a capacity for kindly feelings: let us not squander them on others.

I did do my own stunts.

I can say I made a lot of mistakes, but I don't regret things. Because at least I didn't spend a life standing outside, wondering what living would be like.