The earth is a museum of divine intent.

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)

When true trust has been established, you become one

Patience can be a good thing - but not necessarily. Sometimes it's not so bad to be impatient. I'm a little bit too polite.

I lack self-confidence. I don't know whether I shall ever get it. Perhaps it is better to be unsure of your self, as I am. But it is very tiring.

Take stock of your fears now and see how many of them are senseless. If you are honest with yourself you will probably find most of them are groundless.

This sounds horribly pretentious, but I like to think that if music hadn't existed, I could have invented it.

If you have a craftsman's command of the language and basic writing techniques you'll be able to write - as long as you know what you want to say

I do a lot of running. Bit of squash, bit of tennis. I don't like feeling out of shape.

Change happens not by trying to make yourself change, but by becoming conscious of what's not working.

It is an affront to treat falsehood with complaisance.

Trials are to see if you believe what you say you believe.