It's not so much green energy as brown power: a dairy farm in California said yesterday that it had found a new way to generate electricity for households - using a vat of liquid cow manure, 33ft deep and big enough to cover five football fields. "When most people see a pile of manure, they see a pile of manure. We saw it as an opportunity for farmers, for utilities, and for California," said David Albers, a partner...
photo: AP / /
