Somehow we have to figure out how to boost the price of gasoline to the levels in Europe.

So imagine a world 6 degrees warmer. It's not going to recognize geographical boundaries. It's not going to recognize anything. So agriculture regions today will be wiped out.

I think the Caribbean countries face rising oceans and they face increase in the severity of hurricanes. This is something that is very, very scary to all of us. The island states in the world represent - I remember this number - one-half of 1 percent of the carbon emissions in the world. And they will - some of them will disappear.

Pick the right sized pot, don't pick a pot five times bigger, twice as big.

As the saying goes, the Stone Age did not end because we ran out of stones; we transitioned to better solutions. The same opportunity lies before us with energy efficiency and clean energy.

If I were emperor of the world, I would put the pedal to the floor on energy efficiency and conservation for the next decade.

Coal is my worst nightmare.