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A HeatRisk map shows color-coded risk categories for people confronted by heat that can pose health problems. Excessive heat warnings were issued for more than 20 million Americans late Wednesday, as a heat dome raised temperatures.

A heat dome can bring dangerously high temperatures. What is it?

Much of the Southwest U.S. is experiencing extreme heat this week — with temperatures blazing past 100 degrees. And a phenomenon known as a heat dome is to blame.

Motorists on Highway 101 watch flames from the Thomas fire leap above the roadway north of Ventura, Calif., on Wednesday.

California utility will pay $80M to settle claims its equipment sparked devastating 2017 wildfire

Southern California Edison will pay $80 million to settle claims on behalf of the U.S. Forest Service connected to a massive wildfire that destroyed more than a thousand homes and other structures in 2017.

Countries in the Horn of Africa are experiencing the worst drought in 40 years

Hunger and drought are overwhelming the Horn of Africa again, threatening a humanitarian catastrophe and a warning from aid agencies of an "explosion of child deaths."

The country's two biggest reservoirs are on the Colorado River. Water levels at Lake Powell have dropped steeply during the two-decade megadrought.

The Colorado River rarely reaches the sea. Here's why

More than half of the Colorado River's water is used to grow crops, primarily livestock feed, a new study finds. The river and its users are facing tough decisions as the climate warms.

A formerly sunken boat sits high and dry along the shoreline of Lake Mead at the Lake Mead National Recreation Area, on May 10, near Boulder City, Nev.

U.S. says drought-stricken Arizona and Nevada will get less water from Colorado River

U.S. officials announced Tuesday that the two states, which rely on water from the Colorado River, will face more water cuts as they endure extreme drought.

Receding water in Utah's Great Salt Lake is seen on March 5. Environmentalists are suing the state to force water cutbacks to farmers to save the Great Salt Lake.

Farmers accused of drying up the imperiled Great Salt Lake say they can help save it

Environmentalists are suing Utah to force water cutbacks to farmers to save the Great Salt Lake. Farmers call the blame unfair and say that would have its own environmental and economic consequences.

A fisherman stands on his boat as he navigates near thousands of dead fish awash on the banks of Piranha Lake due to a severe drought in the state of Amazonas, in Manacapuru, Brazil, Wednesday, Sept. 27, 2023.

More than 100 dolphins found dead in Brazilian Amazon as water temperatures soar

Experts believe high water temperatures are the most likely cause of the deaths in the lakes in the region. Temperatures since last week have exceeded 102 degrees Fahrenheit in the Tefe Lake region.

Clusters of African daisies bloom next to an overpass along Interstate 8 near Alpine, California on March 20, 2024. The bright orange and yellow flowers, easily mistaken for native California poppies, are the remnants of a decades-old federal wildflower program.

Scattered along San Diego’s highways, remnants of a decades-old program are abloom

Another wet winter is breathing new life into wildflowers planted years ago under a federal mandate.

A motorist drives on a wet road under a snow-covered hillside Friday, Feb. 24, 2023, in Agua Dulce, Calif. California and other parts of the West faced heavy snow and rain Friday from the latest winter storm to pound the U.S.

Roundtable: California's water capture efforts

More storms hit San Diego County and much of California this week, adding to an already wet winter. What does it all mean for the state’s long-running drought?

Hugh Safford, an environmental science and policy researcher at the University of California, Davis, is silhouetted as he examines damage from the 2021 Caldor Fire in Eldorado National Forest, Calif., near Lake Tahoe on Oct. 22, 2022. Scientists say forest is disappearing as increasingly intense fires alter landscapes around the planet, threatening wildlife, jeopardizing efforts to capture climate-warming carbon and harming water supplies.

Fire, other ravages jeopardize California’s prized forests

Despite relatively mild wildfire seasons this year and last year, California has seen 12 of its largest 20 wildfires — including the top eight — in the previous five years.

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