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About 30 million people in seven western States and two Mexican states depend on Colorado River water. After years of negotiations the U.S. and Mexico plan to sign a landmark water use agreement Nov. 20.

Researchers recently calculated the theoretical food value of the ethanol in a gas tank. At the heart of the calculation is this: Should we burn so much food as fuel? And how will it impact food prices and the world's poor?

A new image of Baja California has emerged: The state has evolved from being best known for dismembered bodies to being hailed as a culinary epicenter with a vibrant art and music scene.

The Cleveland National Forest is elevating its fire use restriction level from "very high" to "extreme" Thursday morning. The ongoing drought and fires in other parts of California prompted the move.

Bad weather in key growing regions was among a confluence of factors driving world food prices to record levels, a U.N. analyst says. But the price spikes are giving U.S. farmers an incentive to boost production.

The Middle East is facing its worst water crisis in decades. For three summers, the annual rains have failed to come. Farmland has dried up in Iraq, Syria, southeast Turkey and Lebanon. The dire conditions are creating a new phenomenon: water refugees.

The headwaters of the Middle East's great rivers, the Euphrates and Tigris, originate in Turkey, which controls flow of the waters to the Arab world downstream. A three-year drought has devastated Syria and Iraq, fueling resentment against the Turks.

U.S. and Mexican officials reached a deal Monday for Mexico to defer part of its water allotment from the Colorado River until 2014 while farmers in the Mexicali area repair irrigation networks damaged by an earthquake this year.

The biggest desalination plant in the western hemisphere is due to begin construction soon in San Diego County. Within the next four years it could be providing up to 10 percent of this region’s drinking water.

Stymied by Congress early on in his term while trying to advance his climate policies, President Obama has resorted to taking incremental actions that don't need congressional approval. Mitt Romney doesn't mention climate change in his energy plan, and favors cheap energy sources like coal.