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

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?"

If [a student's] college’s endowment portfolio has fossil-fuel stock, then their educations are being subsidized by investments that guarantee they won’t have much of a planet on which to make use of their degree.

We have assumed control where once we worked with what we were given.

If it's wrong to wreck the planet, it's wrong to profit from the wreckage.

Scientists had said, "If you keep burning coal and gas and oil, you will melt the Arctic." And then the Arctic melted just as they had predicted. Did Shell Oil look at the melt and say, "Huh, maybe we should go into the solar-panel business instead?" No, Shell Oil looked at that and said, "Oh, well, now that it's melted it will be easier to drill for more oil up there." That's enough to make you doubt about the big brain being a good adaptation.

We spend a lot of time playing defence against bad things. So, in the US, one of the focusses has been this huge Keystone Pipeline project, another has been the coal ports on the Pacific Ocean.