Thousands of U.S. dams could be removed to restore important fish habitat without impacting hydropower generation, experts say
New York City’s East River was once a bustling wildlife habitat. Could yesterday’s ecosystem return to today's metropolis?
The global boom in sand mining threatens millions, a new study of the Mekong River suggests
Scientists are working on turning harmful algae blooms intro practical energy sources
The first National River faces the threat of pollution from a large pig farm
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