First we had the jet-powered bus. Now we have the poop-powered bug. The Bio-Bug is a British invention that runs on human waste. It appears that this is not yet self-propelling with the driver actually supplying the fuel but you can load up with waste from the local sewage works.
It turns out that the toilets of just 70 English homes can power the car for 10,000 miles. It is not clear if results will vary in other countries.
Of course, this makes accidents materially worse, but then again it gives people a feeling that they are contributing to the nation’s transportation grid.
Eventually, one can imagine a truly symbiotic relationship between driver and car.