Environment

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The results of a three-mile long mudslide are seen on Grand Mesa, where the slide started, in a remote part of western Colorado near the small town of Collbran, Monday, May 26, 2014. Rescue teams are searching for three men missing after a half-mile stretch of a ridge saturated with rain collapsed.(AP Photo/Mesa County Sheriff's Office)

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A helicopter prepares to take off on an afternoon flight near the site of a massive mudslide that wiped out almost an entire hillside near the small town of Collbran, Colo., Monday, May 26, 2014. Rescue teams are searching for three men missing after a half-mile stretch of a ridge saturated with rain collapsed. (AP Photo/Grand Junction Daily Sentinel, Dean Humphrey)

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Hundreds of trees are knocked down where a massive mudslide happened near Collbran, Colo., Monday, May 26, 2014. Rescue teams are searching for three men missing after a half-mile stretch of a ridge saturated with rain collapsed. (AP Photo/Grand Junction Daily Sentinel, Dean Humphrey)

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In this May 1, 2014 photo, a dog plays in a rice field flooded with water that is owned by fourth-generation rice farmer Josh Sheppard in Richvale, Calif. Sheppard said he had more than enough water, thanks to superior rights to Feather River water dating to the late 1800s. California’s 19th-century water laws give about 4,000 companies, farms and others unmonitored water while the state is mired in a three-year drought that has forced water cutbacks to cities and the nation’s agricultural center. (AP Photo/Jae C. Hong)

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In this May 2, 2014 photo, farmworkers Sukha Singh, left, and Bitu Singh install a drip irrigation system in a peach orchard in Yuba City, Calif. Many farmers in the area are switching to drip irrigation system in efforts to conserve water. (AP Photo/Jae C. Hong)

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This May 3, 2014, photo shows some rice fields owned by second-generation rice farmer Al Montna flooded with water in Yuba City, Calif. “In a good year we wouldn’t be able to stand here unless we got wet. This year it won’t produce anything,” said Montna as he knelt in the dust, pulling apart dirt clods on the 1,800 acres he left idle because of scarce water. (AP Photo/Jae C. Hong)

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In this May 2, 2014 photo, dust rises around a walnut tree as a worker mows weeds in Gridley, Calif. California’s 19th-century water laws give about 4,000 companies, farms and others unmonitored water while the state is mired in a three-year drought that has forced water cutbacks to cities and the nation’s agricultural center. (AP Photo/Jae C. Hong)

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In this May 2, 2014 photo, a boat sails across the Lake Oroville near Oroville, Calif. The reservoir, a water source for many farmers in the region, holds less water than it should around this time of the year. (AP Photo/Jae C. Hong)

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This April 30, 2014, photo shows a sign warning of rising food cost due to drought stands along Interstate 5 in Coalinga, Calif. According to the U.S. Drought Monitor, California is experiencing extreme drought in more than 70 percent of the state. (AP Photo/Jae C. Hong)

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CNA Vice Chairman and retired Navy Vice Adm. Lee Gunn is president of the American Security Project, a private think tank whose primary issue is warnings about climate change. (U.S. Navy)

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In this May 7, 2014 photo, roses bloom in the drought-tolerant garden at the Hacienda Carmel Retirement Community in Carmel, Calif. California’s 19th-century water laws give about 4,000 companies, farms and others unmonitored water while the state is mired in a three-year drought that has forced water cutbacks to cities and the nation’s agricultural center. (AP Photo/Jae C. Hong)

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In this May 6, 2014 photo, Steven Ritchie, an assistant general manager of San Francisco Public Utilities Commission, walks on a bridge over Moccasin reservoir at the Moccasin Powerhouse in Moccasin, Calif. Tuolumne River water rushes through the plant, creating electricity, then goes into the reservoir before being carried by tunnels to San Francisco Bay Area taps. (AP Photo/Jae C. Hong)

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In this May 1, 2014 photo, a group of children cool off in the Feather River in Yuba City, Calif, where, according to some local residents, the water level is significantly lower than it used to be. Some of California’s drought-ravaged reservoirs are running so low that state water deliveries to some metropolitan areas have all but stopped, and cutbacks are forcing growers to fallow fields. (AP Photo/Jae C. Hong)

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In this May 1, 2014 photo, farmworker Chris Volkman examines the rice field sprayed with liquid fertilizer before getting water in Richvale, Calif. California’s drought-ravaged reservoirs are running so low that state water deliveries to some metropolitan areas have all but stopped, and cutbacks are forcing growers to fallow fields. (AP Photo/Jae C. Hong)

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In this May 1, 2014 photo, fourth-generation rice farmer Josh Sheppard walks across the dried-up ditch at his rice farm in Richvale, Calif. California’s 19th-century water laws give about 4,000 companies, farms and others unmonitored water while the state is mired in a three-year drought that has forced water cutbacks to cities and the nation’s agricultural center. (AP Photo/Jae C. Hong)