Imagine dousing your salad with the same oil that you put into your tractor for diesel fuel. What may sound crazy now is much closer than you think. In Europe, Deutz developed the first diesel engine that runs on rapeseed (canola) oil. Farmers can raise their own rapeseed, run it through a rapeseed mill on the farm, and put it in a fuel tank for the tractor. A tractor from Same Deutz-Fahr and one from Fendt are equipped with the new vegetable-oil engine. In addition, Deutz is testing engines with soybean and sunflower oil.

There also was a tractor several decades ago that could use fuel oil. That just proves there are few new ideas — just recycled ones.