When you have solar panels, your electricity gets there for free, no one's figured out how to meter the sun yet. And that's good.

The latest computer modeling I've seen indicates that at mid-century, there might be 150 million people classified as "environmental refugees."

If you were running a solar company you may be okay - you may be able to keep growing. The question for physics is: Can you grow fast enough to begin to catch up with the damage?

A price on carbon sufficient to keep 80% of current reserves underground, rebated directly to citizens.

I think fracking for gas will reduce the incentive to turn to renewables, and I think it will do a lot of other damage across the countryside.

We couldn't outspend the fossil fuel industry - they have more money than God.

To me, it's more important to take the 60-70% of people who really understand that there's a problem [of climate change] and get some percentage of them active than to try and stamp out the last embers of pre-scientific thought.