Seven days: 29 March–4 April 2013 : Nature News & Comment: US waterways in bad shape
Aurora Photos/Alamy
RESEARCH
US waterways in bad shape More than half of US rivers and streams are in a poor environmental condition, according to a survey published by the Environmental Protection Agency on 26 March. The data from 2008–09 — the most recent available — show that 28% of the nation’s waterways have excessive levels of nitrogen, and 40% have high levels of phosphorus. This nutrient pollution causes algal blooms (pictured; near the Iron Gate dam on the Klamath River in northern California), the breakdown of which saps water of the oxygen that aquatic life needs to survive. “This is the most dire in a string of water assessments over the last 20 years,” says Earthjustice, an environmental law organization in San Francisco, California
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