The latest news from California is one smart idea. Western United Dairymen, based in Modesto, will run four milk tankers on methane derived from cow manure.

The yearlong project could reduce air pollution from diesel fuel while helping dispose of manure in a way that protects air and water, said Michael Marsh, the group’s chief executive officer. The milk truck project is funded by a $400,000 grant from the U.S. Environmental Protection Agency.