I've just come inside from spraying a nasty chemical on a biofuel crop (synthetic pyrethrin on canola) and I'm wondering if it will even be possible Post Petroleum. The more I think about it the more I think the localised gasification/charcoal approach is best. Use not only garbage but roadside weeds that survive with or without FF input. Cook food and heat water with charcoal pellet stoves that work out a few cents per kilowatt hour equivalent, then put the ash on the garden. The really big hurdle seems not to be harvesting or charcoal making but gas-to-liquids technology. When that cost comes down I see at least a partial way forward.