Agiant, 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 and cleaned instead of released into the atmosphere. A new study...

For decades, Californians, and by extension, Americans, have lived alongside unhealthy flame-retardant chemicals embedded in their furniture, thanks to a few lines in a 1970s state law. David Volz, University of California, Riverside professor of environmental toxicology, has long studied...

Despite cleaner cars on the road, a University of California, Riverside study shows that higher speed limits can make city air dirtier. The study compares auto emissions data collected in both the Los Angeles and Salt Lake City metro areas...

Storms now pounding Southern California are raising the specter of more danger for residents -- debris flows in areas already reeling from devastating fires. Debris flows are like mudslides, except much faster and more destructive, as they contain a mix...