When rain gets scarce, we turn a tap, and water flows readily from hoses and sprinklers in yards across the nation, making it easy for us to take the resource for granted. But with climatologists predicting weather extremes in all corners of the globe in the next century, wise water use will become even more critical for all American gardeners and farmers. Hardiness zones have already changed in just the past 20 years; warm-region growing conditions are moving farther and farther north. And drier conditions are racing north, as well. Drought already costs U.S. citizens $6 billion to $8 billion a year on average, and according to a study from the National Center for Atmospheric Research, we could face extreme drought within just 30 years.
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