How much will you do to make the planet greener? How about installing a biodigester to power your computer - pass the beans please? Grin. It really is tried a true way to produce electricity but not usually one household at a time. In India and China folks bring their waste to a communal digester that gives them all some needed cheap electricity from burning methane or just gas for the stove.
ENERGY-BRAZIL: Putting (Human) Waste to Work