 This is a Bloomberg Money Minute. Cows and their manure are major sources of methane, a potent greenhouse gas. The U.N. says livestock account for about 32 percent of human-caused methane emissions. Some states, like California, are encouraging dairies to install methane digesters. Brent Wickstrom of Wickstrom Jersey Farms tells the Associated Press the idea is to capture the methane. So instead of going into the atmosphere, it's captured and sent in a pipeline about 20 miles to their ethanol plant.