When oil is illegal we’ll all be relying on fifty of these bio-fuel furry space heaters.
In all seriousness, there’s a German biofuels researcher who powers his volkswagen diesel with fuel made from the bodies of dead cats. He buys them from a vetinary crematorium a ton at a time and cooks them into diesel.
Then there’s the guy at U of I who came up with diesel made of hog manure...