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.

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.

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.

My house is covered in solar panels, I'm a great believer in all this - we all should be doing this.

I think that it is impossible to think of a threat to social justice greater than what we are doing to the earth's atmosphere at the moment.

Oil companies are radical because they're willing to alter the chemical composition of the atmosphere.

But tolerance by itself can be a cover for moral laziness.