The time scale humans operate on is extremely short by geological standards. To provide some reference for how ambitious this project is, the famous pyramids in Egypt are only about 5,000 years old. The history of agriculture itself only goes back about 12,000 years. Ten-thousand years ago, nearly every human on this planet was a hunter-gatherer, and now nearly every human lives in an industrial society. This clock, even if it lasts only half as long as planned, is likely to outlast nearly every other significant artifact of our culture.