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After more than 50 years of research, scientists still don't know exactly what causes autism. But the data make clear that genetics are an essential piece of the puzzle.

The California Department of Fish and Wildlife is recommending listing mountain lions in Southern California and the Central Coast as threatened.

A new study found that in the Eaton and Palisades fires, homes that had already adopted proposed regulations on creating vegetation-free buffers were less likely to burn.

Scouts recently returned to Camp Josepho for the first time since the fire. They came to clear overgrowth, clear mudflows and help restore the land.

More buildings are going all-electric, especially in states trying to address climate change. UCI Health-Irvine, the largest all-electric hospital in the country, is opening Wednesday.

Halle Berry called out Gov. Gavin Newsom for vetoing a bill guaranteeing women access to menopause treatment. Earlier, the Trump administration removed 'black box' warnings from hormone therapy drugs.

A CDC advisory panel voted Friday to stop recommending the hepatitis B vaccine for newborns, potentially putting the preventative measure out of reach for millions of poor families.

The Trump administration plans to send more water to Central Valley farmlands. California is objecting, saying that poses multiple threats.

A California environmental board approved a state plan outlining strategies to safely reduce hazardous waste -- despite sharp criticism from environmental groups who say several proposals could invite deregulation.

A beloved eagle, a school mascot, was electrocuted on PG&E power lines near an elementary school in the Bay Area. Could anything have been done to prevent it? How often does this happen?