A world where one tenth of the population gets to be extremely wealthy, and six tenths very poor, is not, in the long run, a stable place.

The roof of my house is covered in solar panels. When Im home, Im a pretty green fellow.

A voluntary simplification of life-styles is not beyond our abilities, but it is probably outside our desires.

On the top of these mile thick slabs of ice the water is percolating quickly to the base and greasing the skids, as it were, for the slide of that ice into the ocean.

It's off the charts - and if you don't believe the scientists, ask the insurance industry, the people we pay to analyze risk in our society.

I just keep trying to explain what's going on with our planet - and now, to explain what's going on with our politics, which explains why we're not doing anything about the former.

[Kids] will grow up into a world that's difficult and wonderful, and they'll make the best of it they can, and hopefully help turn it in the best possible direction.