70 homes' waste is enough to power this eco-friendly VW Beetle for a year. Whether you'd want to drive the "Powered by your own waste!"-emblazoned car is another thing entirely, however.

The Bio-Bug (or Dung Beetle, as we here at Gizmodo have dubbed it) is driving the streets of Bristol, England, for the next year, part of a campaign to wisen people up to green issues.

Methane gas is already used in Sweden in place of fuel, with 11,500 cars reportedly running on their natural gases. [BBC via UberGizmo]