Interesting show on the History Channel, Modern Marvels. They're talking about LFG: Land Fill Gas. Land fills throw off Methane, a worse Greenhouse gas than CO2. By tapping the landfill, they are able to collect the Methane, keeping it from escaping into the atmosphere, and, in the example cited, send it to a soybean proceesing plant that has reduced it's dependance on LNG to near zero. The plant does turn the methane to CO2, but in lesser amounts than LNG, and prevents the methane from venting into the atmosphere.
so there.