COPENHAGEN (AP) -- The United States is counting on cows to save the planet.

U.S. Secretary Tom Vilsack announced an agreement with the American dairy industry Tuesday, Dec. 15, to reduce the industry's greenhouse gas emissions 25 percent by 2020, mostly by convincing farmers to capture the methane from cow manure that otherwise would be released into the atmosphere.

"This historic agreement, the first of its kind, will help us achieve the ambitious goal of drastically reducing greenhouse gas emissions while benefiting farmers," Vilsack said at the U.N. climate talks. "(The) use of manure (in) technology is a win for everyone."

Agriculture accounts for about 7 percent of the greenhouse gas emissions in the U.S.

The plan calls for persuading more American farmers to purchase an anaerobic digester, which essentially converts cow manure into electricity. The problem is that until now, only 2 percent of U.S. dairy farmers are using the technology, mostly because it is too costly for family farmers.

More than 60,000 dairy farms carry about 9 million cows in the U.S., but 77 percent of those farms have fewer than 100 cows, according to Dairy Farming Today, an industry group. Farms that would be interested in the new green techology would likely have more than 100 cows.

Thomas Gallagher, the chief executive officer of the Innovation Center for U.S. Dairy and Dairy Management Inc., which signed the agreement with the government, said the commitment shows that U.S. farmers are concerned with making their operations increasingly sustainable.

"This memorandum came about because of the commitment of U.S. dairy farmers and the dairy industry to a sustainable future," Gallagher said. "Sustainability goes hand-in-hand with our heritage of taking care of the land and natural resources while producing nutritious products that consumers want."

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