The power of cow entrails

Yes, that's right, cow entrails. The BBC reports that "[t]he world's first biogas-powered passenger train is taking its first passengers between the Swedish cities of Linkoping and Vastervik. And the biogas comes from the entrails of dead cows." So, too, Linkoping's buses and taxis.

And there's more from these forward-looking Swedes: "This year, Saab started selling a biopowered version of their 95 model. Its engine will take a fuel cocktail which is up to 85% bioethanol, made, principally, from Brazilian sugar beet."