Permaculture is a simple idea: we can design human settlements to be self-sustaining farms, providing food and water without requiring extensive investment of outside resources. This Times article has more:

In practice, permaculture is a growing and influential movement that runs deep beneath sustainable farming and urban food gardening. You can find permaculturists setting up worm trays and bee boxes, aquaponics ponds and chicken roosts, composting toilets and rain barrels, solar panels and earth houses.

Truly, permaculture contains enough badges of eco-merit to fill a Girl Scout sash. Permies (yes, they use that term) like to experiment with fermentation, mushrooming, foraging (also known as wildcrafting) and herbal medicine.

Yet permaculture aims to be more than the sum of those practices, said David Cody, 39, who teaches the system and creates urban food gardens in San Francisco.

“It’s an ecological theory of everything,” Mr. Cody said. “Here’s a planet Earth operating manual. Do you want to go along for a ride with us?”