Carbon tax has the advantage of basically being able to subsidize one set of activities that you want with another set of activities that you don't want. It's like a cigarette tax.

There should always be in sight the draw — a kind of a beacon that draws you on through the labyrinth.

When the government tries to run innovation, sometimes it does it well and sometimes it doesn't. So setting up a situation where the market runs innovation, which is a cap-and-trade idea, may well have more flexibility.

A building is not something you finish. A building is something you start.

Historians will consider this a dark age. Science historians can read Galileos technical correspondence from the 1590s but not Marvin Minskys from the 1960s.

The main problem with solar on the Earth's surface is that it is so intermittent, and we don't have decent storage yet.

Many of my contemporaries in the developed world see subsistence farming as soulful and organic, but it is a poverty trap and an environmental disaster.