Here in Germany Volkswagen had a brilliant idea:
the New Beetle that runs with metan gas produced with human shit.
Now, that is really energy low cost.
On one hand it disposes of unwanted escrements and on the other is good energy fully Co2 neutral... I bet it will be a best seller.
"The results are impressive. A converted 2.0-liter, four-cylinder engine runs on the biogas and can go speeds of about 114 miles per hour, Filipponio reports. He adds that it uses regular gas to start and then immediately switches to methane. Apparently drivers won't be able to tell the difference between driving in a standard car and one powered by the gas.
GENeco says that 70 households' worth of human waste is enough to power the vehicle for a year or 10,000 miles. While I still have lingering questions about methane for use in vehicles, including just how much cleaner the process is end-to-end compared to electricity or biodiesel, this little dung Beetle certainly shows promise. At the very least it proves that little bugs can achieve big things.
The Volkswagen "Bio-Bug" runs on methane gas from the British sewage treatment company GENeco."