A giant, balloon-like tarp stretches over a lagoon of manure on a Central Valley dairy farm, concealing a quiet but remarkable transformation. Methane, a potent climate-warming gas, is being captured ...

Biogas made from dairy and pig manure has long been an energy source non grata for environmental groups across the country.

Groups that focus on the environment and small farms are praising a decision by the U.S. Department of Agriculture to pause ...