If you are one of the 25% of American (U.S.) households who use a septic tank system to treat your household sewage, it is possible to modify your septic tank to produce usable methane or gobar . Research on the subject has mostly been done in foreign countries such as Nigeria, but interest is growing. In the U.S. research mostly centers around commercial applications because of the enormous profit. Many factories are powered by their waste. Septic tanks produce significant amounts of methane and dump this powerful (in more ways than one) greenhouse gas into the atmosphere where it contributes to global warming. I do include the topic on myPlease Log In to view this link!