Drought clouds skies for US farmers

As the United States bakes in one of the hottest summers since the Dust Bowl years of the 1930s, drought from the Dakotas to Arizona through Alabama has sharpened the focus of farmers on their lifeline: water.

Eighty percent of all fresh water consumed in the United States is used to produce food. But years of drought, diversion of water to growing urban areas and, most lately, concerns about global warming are feeding worries.