CASA GRANDE — Thousands of gallons of liquid manure sit in the open on 25-foot deep settling ponds at Casa Grande Dairy Co. Farm owner Jim Boyle says he could earn some extra revenue by taking biogas, ...

Let down by electric utilities, farmers bet on natural gas as a more promising way to make a return from cow manure. This story is the second in a three-part series. Read the first and third ...

ST. PAUL -- The House and Senate have provided $660,000 to provide loans to finance manure digester systems. Manure digesters take farm animal waste, trap the methane gas from the manure and convert ...

PIXLEY, Calif. (AP) — The stench of cow feces, urine and ammonia forces residents to keep windows and doors closed in parts of California's farming country. Some people constantly run air purifiers at ...

MADISON - New research conducted by environmental groups argues that manure digesters, seen as a solution to pollution from large-scale livestock farms, do more harm than good because of other ways ...

A growing national market in the proceeds from manure digesters—a technology developed to rein in emissions and fight global warming—is sowing worry that the economic paybacks could undercut U.S.