The latest computer modeling I've seen indicates that at mid-century, there might be 150 million people classified as "environmental refugees."

When you are in a hole, stop digging!

When you have solar panels, your electricity gets there for free, no one's figured out how to meter the sun yet. And that's good.

I did very much like [Barack] Obama's attack on fossil fuel subsidies for fossil fuel companies. We asked for that in demonstrations and petitions, and now we'll try to push it forward.

The habits of the West in terms of consumption.

I imagine a certain amount of consumer impulse will be replaced by community connection. You can already see it starting with things like the local food movement.

[Political actions] has to happen on the local and state level; we have to convince our cities to join the growing number of more than 200 American cities who have signed on to the mayor's climate campaign.