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

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.

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.

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.

California workforce regulators are recommending that the state stick with a July 31 deadline for updating certain employer pandemic safety rules.

The National Weather Service issued red flag warnings throughout parts of the state. Cal Fire says winds and low humidity are expected to exacerbate fire conditions and drive up temperatures.

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.

Extreme fires are more likely with climate change, and they're making it harder for some tree species to regenerate. Ecologists say this could transform large areas of Western forest into grassland.

A symbol of Lebanon's resilience through its long, turbulent history, the country's towering cedars now face increasing threats from wildfire and parasites, both fueled by global warming.

San Diego County supervisors Wednesday unanimously approved policies focused on environmental sustainability, and offered residents and businesses new tools to expand the natural habitat.