Back to Nature - Handbuch für Malawi Buntbarsche 2. Auflage by Ad Konings

By Ad Konings

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6 Factor in drought conditions that already affect areas of the United States, and that number climbs to 46 states! The National Climatic Data Center reported that as of the end of August 2010, nearly 10 percent of the contiguous United States was affected by drought. 7 Some other grim numbers to think about include: • The temperature-related national energy demand for summer 2010 was the highest in 116 years. 8 • The Great Lakes is the largest freshwater lake system in the world and holds one-fifth of Earth’s freshwater.

18 However, says Udall, cleaning up the dust won’t solve Las Vegas’s or the Colorado River’s overuse and overallocation problems. “Say we’re losing 5 percent of the water. In a perfect world, we could prevent 50 percent of that loss, which is more or less what Las Vegas uses in a year. ” There are numerous causes of the overuse, adds Udall, and the problems are shared by the Lower Basin states of Arizona, California, and Nevada. indd 40 2/18/11 7:45:09 AM WH E R E O U R WATE R CO M E S FRO M 41 nineteenth-century water law, and cheap water in the American Southwest are huge long-term issues.

S. lakes, rivers and streams, recharge of aquifers, and so on. That’s one reason El Niño and La Niña are perennial hot topics. Both concern changes in surface water temperatures in the Pacific and resulting weather patterns and precipitation across the United States. El Niño generally means a more active southern jet stream, which can lead to storms and more rain across the United States. S. 12 Climate change progresses around the globe, too. But the global connections between, for example, drought in Africa and the United States are inadequately understood, says Gleick.

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