A global shift to increased cycling and electric biking could cut energy use and carbon dioxide emissions from urban transportation by up to 10 percent by 2050 compared to current estimates.

In the summer, the air around California’s Central Valley rivers and streams is lively with birds flapping and chirping.

Humans are the biggest threat facing mountain lions in southern California, where the animals only have about a 56 percent survival rate.

Native wildflowers in California are losing species diversity after multiple years of drier winters, according to a new study.

How does an acorn know to fall when the other acorns do? What triggers insects, or disease, to suddenly break out over large areas?

California’s San Joaquin Valley is being further polluted by secondhand smog from outside the state’s borders.

Scientists say they’ve uncovered one reason zebras have stripes: they act like insect repellent, keeping away blood-sucking flies.

Thousands of dead red abalone that washed up on the beaches of Sonoma County in Northern California in 2011 were the victims of a harmful algal bloom, according to a type of crime scene investigation that combines field surveys, toxin testing, and genomic scans.