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Tens of millions of Americans are forced to live with wildfire smoke now every year. New research shows that it's more invasive than previously thought, infiltrating homes, schools and offices.

Two water agencies that serve the Fallbrook and Rainbow areas want to separate from the San Diego County Water Authority. They say they could get better rates elsewhere.

NOAA is updating its definition of what a "normal" Atlantic hurricane season looks like, based on the last 30 years. The average number of hurricanes in the new normal has risen from 6 to 7.

Joel Charny, who worked in humanitarian aid for 40 years, speaks candidly about how humanitarianism has changed — and why people shouldn't treat aid workers as if they wear haloes.

Pacific Gas & Electric plans to bury 10,000 miles of its power lines in an effort to prevent its fraying grid from sparking wildfires when electrical equipment collides with millions of trees and other vegetation.

Fire danger remained high Friday amid unpredictable wind gusts and dry conditions in Southern California, as crews made progress against blazes that burned several homes and injured two firefighters.

State officials are warning that two dry winters could have an impact on the amount of water that can be delivered from the Sacramento Delta, but local supplies appear to be adequate.

The population of monarch butterflies that migrated south to Mexico to hibernate fell 26% from a year earlier.

The popular vacation haven normally filled with tens of thousands of summer tourists emptied out Monday as the massive Caldor Fire rapidly expanded.

A California blaze that erupted near the flashpoint of the deadliest wildfire in recent U.S. history is heading away from homes but survivors of the 2018 blaze in the town of Paradise are worried that history could repeat itself.