Last month I visited Erath County, Texas, proud home to more than 64,000 cows. Each of these beasts delivers thousands of gallons of milk each year, and something else, too – over 100 pounds of waste, per cow, per day. With the need for greener power growing, all that dung has become a valuable resource.
http://www.plentymag.com/features/2008/08/power_from_cow_poo_heats_homes.php
