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The Mississippian American Indian culture rose to power after 900 A.D. by farming corn. Now, new evidence suggests a dramatic change in climate might have led to the culture's collapse in the 1300s.

The heat wave will move out by Monday, but looking ahead, forecasters are projecting a warm and dry summer of above average temperatures and periodic heat waves.

San Diego is home to nearly a quarter million veterans. And as they age, they inevitably die. The Department of Veterans Affairs is making room for their graves.

Photographer Matt Black spends his days capturing images that illustrate the impact of the drought on people living in California's Central Valley.

Several large wildfires are burning in Arizona, Nevada and New Mexico. Severe drought has led to a hot start to this year’s fire season. While we may not see massive wildfires this year, fire experts warn it may happen in the near future.

Authorities cut off service to the capital, Santiago, following torrential rains that contaminated the water supply. People are now scrambling to find alternative sources of drinking water.

The drought in California prompted San Diego leaders to step up conservations efforts this week, ordering residents and businesses to cut back on outdoor watering.

Water is the most worrisome issue facing California residents, and concern about water tops worries about the economy for the first time in a new poll.

Right now, the government rents farmland to help protect soil and water. But once the land is farmed again, the benefits disappear. Environmentalists want to change that.

The U.S. military has been working on projects ranging from solar power to assessing the impact of climate change on global conflicts. Advocates worry those programs may be in jeopardy.