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

Redefine the possible.

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.

There's no unemployment in squatter cities. Everyone works. One-sixth of humanity is there. It's soon going to be more than that.

[Wind energy] takes a very large footprint on the land, five to 10 times what you'd use for nuclear, and typically to get one gigawatt of electricity is on the order of 250 square miles of wind farm.

The point is to explore whatever may be helpful for thinking, understanding, and acting responsibly over long periods of time.

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