Economist: Fuel cells powered by cheese, though not a new idea, are looking more attractive as an alternative, and greener, energy source. Whey, a byproduct of cheese making, is rich in lactose and, when consumed by bacteria, can produce an electric current. The process is doubly beneficial. Whey is considered an environmental hazard and manufacturers must find a way to safely dispose of it anyway. Another example of recycling cheap raw-waste products as fuel is the use of vegetable cooking oil to power automobiles.