More than you probably wanted to know about methane department: Leave it to us ecologically minded northwesterners, but one of the big movements (so to speak) here is called "Biomass," and it produces energy from, you guessed it, manure and the methane that manure releases. Some farms can power themselves just on the biomass they themselves produce. It's a major source of "green" (well, .......) energy initiatives up here.