Much has been made about the environmental costs associated with natural gas drilling, but there’s a different type of natural gas that’s produced by every one of the planet’s more than 7 billion inhabitants that requires no drilling at all. Seeking to tap into that natural resource, General Motors is hard at work developing a next-generation hybrid vehicle fueled by human-produced methane gas. For its all-new RE:VOLT model, GM has developed a methane capture and sequestration device that will be built into each passenger seat. The green vehicle is expected to hit dealerships in 2013, and it promises to bring new meaning to the phrase “Drive by the seat of your pants.”