Federal officials have put trade tariffs on Chinese solar panels. American solar companies are split on whether it will be good or bad for the industry.

The National Ignition Facility in Livermore, California, has been called a modern-day moon-shot, a project of "revolutionary science," and "the mother of all boondoggles."

Green building and sustainable design are a trend in California, but nowhere is the urgency greater than in China, where hundreds of millions of people are moving to cities in pursuit of a better life.

The crisis of mental disorders such as PTSD has forced the military to rediscover therapies that would have considered from-the-fringes a generation ago.

One of California's oldest environmental battles is on the San Francisco ballot. Hetch Hetchy Valley in Yosemite National Park holds most of San Francisco's water supply. But some environmental groups want to turn back the clock.

A group of West Oakland students treks up to the Sierra to try to help a small mammal that may be threatened by climate change.

For years, farms and cities have pumped water out to meet their needs. But now, as water supplies dwindle, there’s a major movement afoot to put some water back.

Scientists say the waters off the West Coast could be hit hard by ocean acidification, but thanks to the natural conditions, it's a good place to study how ocean species might adapt.

California's warming climate is having a big impact on farmers. Find out more from our multimedia series, "Heat and Harvest."

Nail biting, skin picking, hair tending-- in "pathological groomers" normally healthy urges go haywire.