Cow Power

It's not only the methane that cows produce that could be turned into energy (the question becomes how to capture their burps and farts without making them look like cowstranauts), you can also make biofuel from whey (little did little miss Muffet know)!
Put a cow in your tank

clipped from www.treehugger.com NZ has its own dominant industry, outside of sheep, that is:- Dairy. So why not make ethanol from all that by-product from milk production, namely whey. Gull Petroleum convinced New Zealand’s Prime Minister, Helen Clark, to pump their first public tank of Force 10 biofuel, which contains a 10% blend of whey-derived ethanol and 90% high octane petrol lthough whey is a waste product this is not the first creative use of the residue. Anchor Ethanol, a subsidiary of Fonterra Co-op, who is making the ethanol for Gull, already supply the market with the milk-based raw material for production of pharmaceuticals, perfumes, printing inks and even vodka and rum. All derived from whey