Ice in the West Antarctic and over Greenland, i.e., ice that's over a rock at the moment, that will raise the level of the sea as it slides into the ocean, putting at risk everyone and everything that lives on the coasts, and that includes an enormous percentage of the world's people.

We also have to engage - and I think this is important - in national politics because there is no way to address questions of this scale in the short time that we have to address them without engaging in real political change.

By themselves, they are not enough; we also need to engage in political action.

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

We'd like to get the fossil fuel industry on the back foot for a while, having to deal with us.

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

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.