You can have a healthy fossil-fuel balance sheet, or a relatively healthy planet

Climate change is a huge problem, an almost insoluble problem.

Fossil fuel is very seductive stuff. [John Maynard] Keynes once said that, as far as he could tell, the average standard of living from the beginning of human history to the middle of the eighteenth century had perhaps doubled. Not much had changed, and then we found coal and gas and oil and everything changed. We're reaping the result of that, both ecologically and socially.

I think that so far the political and economic power of the fossil fuel industry has trumped all else.

I'm guessing the most efficient way would be to transfer an awful lot of technology, but also direct aid to deal with climate emergencies already underway. Hillary [Clinton] has already said $100 billion a year would be appropriate.

The polling data shows not an unbelievable level of concern [on climate issue] but a general awareness of this problem. And now I think it's up to all sorts of people who really care about these things to continue on this new ground to try and make this the central political issue it needs to be.

Delhi is locked in a complete choking smog at the moment - they've had to close schools in one of the world's biggest cities. They have their own reasons for needing to get off fossil fuels fast.