cow gas

One contributor to global warming — bigger than coal mines, landfills and sewage treatment plants — is being left out of efforts by the Obama administration and House Democrats to limit greenhouse gas emissions.

Cow burps.

Belching from the nation's 170 million cattle, sheep and pigs produces about one-quarter of the methane released in the U.S. each year, according to the Environmental Protection Agency. That makes the hoofed critters the largest source of the heat-trapping gas.

In part because of an adept farm lobby campaign that equates government regulation with a cow tax, the gas that farm animals pass is exempt from legislation being considered by Congress to limit greenhouse gas emissions.

The EPA under President Barack Obama has said it has no plans to regulate the gas, even though the agency recently included methane among six greenhouse gases it believes are endangering human health and welfare.

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Vermont dairy farmers Tim Maikshilo and Kristen Dellert, mindful of shrinking their carbon footprint, have changed their cows' diet to reduce the amount of gas the animals burp — dairy cows' contribution to global warming.

Coventry Valley Farm is one of 15 Vermont farms working with Stonyfield Farm Inc., whose yogurt is made with their organic milk, to reduce the cows' intestinal methane by feeding them flaxseed, alfalfa, and grasses high in Omega 3 fatty acids. The gas cows belch is the dairy industry's biggest greenhouse gas contributor, research shows, most of it emitted from the front and not the back end of the cow.

"I just figured a cow was a cow and they were going to do whatever they were going to do in terms of cow things for gas," said Dellert. "It was pretty shocking to me that just being organic wasn't enough, actually. I really thought that here we're organic, we're doing what we need to do for the planet, we're doing the stuff for the soil and I really thought that was enough."

She learned it wasn't. The dairy industry contributes about 2 percent to the country's total greenhouse gas production, said Rick Naczi, a vice president at Dairy Management Inc., which funds research and promotes dairy products. Most of it comes from the cow, the rest from growing feed crops for the cattle to processing and transporting the milk.

To satisfy consumers' demands for sustainable production, the Innovation Center for U.S. Dairy in Rosemont, Ill., is looking at everything from growing feed crops to trucking milk to reduce the industry's greenhouse gas emissions by 25 percent by 2020. That would be the equivalent of removing about 1.25 million cars from U.S. roads every year, said Naczi, who manages the program.

One way is by feeding cows alfalfa, flax and grasses, all high in Omega 3s, instead of corn or soy, said Nancy Hirschberg, head of Stonyfield's Greener Cow Project. The feed rebalances the cows' rumen, the first stomach of ruminants, and cuts down on gas, she said. Another way is to change the bacteria in a cow's rumen, Naczi said.