Makes methane from almost anything organic: http://pesn.com/2005/05/16/6900096_Syngas/
"The prototype model has already been successfully tested using a number of inputs including low-grade coal, wood waste and other biomass, yielding superior results with lower costs and emissions than currently available technology. The SynGas technology produces electricity and/or pipeline quality synthetic gas, as a replacement for quickly depleting natural gas and oil, at low costs, with the additional benefit of zero airborne emissions."
