[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.

Humans have made a huge hole in nature in the last 10,000 years. [With de-extinction,] we have the ability now, and maybe the moral obligation, to repair some of the damage.

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

The great problem with the future is that we die there. This is why it is so hard to take the future personally, especially the longer future, because that world is suffused with our absence.

Do what's good for humans, modeled on how humans already do things; ignore what's convenient for computers.

The technology of synthetic biology is currently accelerating at four times the rate of Moore's Law. It's been doing that since 2005, and it's likely to continue.

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