Government needs to do two things: put a price on carbon and invest heavily in new technologies.

Each and every one of us should stop playing small and license ourselves to become one of the giants of the new century. We will need champions by the truckload.

I think the most important thing is discovering an idea that moves you, and then letting people who are moved by that idea find each other, and work together. A lot of times people focus on the technical side-"oh, I've got to take a class on non-profit development." Too few people allow themselves to think outside the box with regard to their issue areas.

If the road to social transformation can be paved only by saints who never make mistakes, the road will NEVER be built.

The thing about this [Donald] Trump phenomenon is that there's a lot of good stuff in it; the anti-elitism, the concern for working class jobs.

Reversing global warming will take a World War II level of mobilization. It is the work of tens of millions, not hundreds of thousands.

All humans have fear, and those of us who are fortunate have faith.