We have to transition to new technologies, making it more expensive to continue with the old and polluting technologies and cheaper to go to the clean ones.

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)

Scratch the heresy and you will find the leper. Every battle against heresy wants only this: to keep the leper as he is.

Then comes Winston with his hundred horsepower mind and what can I do?

Here at CBS, spring also means March Madness. I love the name March Madness. I'm glad the PC police haven't made us change March Madness to early spring psychosis.

The kind of audience I'm speaking to is a very wide range of people.

The fish you release maybe a gift to another, as it may have been a gift to you.

Something happens, Blue thinks, and then it goes on happening forever. It can never be changed, can never be otherwise.

Doctors have throughout time made fortunes on killing their patients with their cures. The difference in psychiatry is that it is the death of the soul.

You have only 30 seconds with a new person. I will give you a hug so you know I’m real, and then you’re real too.

There's nothing harder than going on TV and saying something that you don't believe. I don't do that anymore.

One of the great things about young people is that they do question, that they do care deeply about justice, and they they have open minds.