Bushy, Jed and Adam chat with Dr Samuel Alexander, founder of the Simplicity Institute and author of many books, and a new as-yet-unpublished essay 'Carbon Civilization and the Energy Descent Future', written with Joshua Floyd. They talk about making cooking gas (biogas) from your household compost, as Sam is doing in his own backyard, and while they're at it, look at the history of how energy has influenced the cultural evolution and structures of the human race.