How old is California's Yosemite Valley?

First-time visitors to Yosemite Valley gape in awe at the sheer granite wall of El Capitan and the neatly sliced face of Half Dome, aware, perhaps vaguely, that rain and glaciers must have taken a long time to cut and sculpt ...

Air quality warning as Oregon wildfire grows

A wildfire raging out of control in Oregon grew in size Tuesday as residents faced evacuation orders and worsening air quality as multiple blazes scorch the US West.

Oregon blaze latest major wildfire to engulf US West

A massive wildfire burned out of control Monday in Oregon forcing residents to flee and threatening towns and thousands of homes, in the latest blaze to scorch the US West during a blistering summer.

California's trees are dying, and might not be coming back

The State of California is banking on its forests to help reduce planet-warming carbon dioxide in the atmosphere. But that element of the state's climate-change solution arsenal may be in jeopardy, as new research from the ...

How cities in the West have water amid drought

As drought and climate change tighten their grip on the American West, the sight of fountains, swimming pools, gardens and golf courses in cities like Phoenix, Las Vegas, Los Angeles, Salt Lake City, Boise, and Albuquerque ...

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