Salt marshes are among the most productive systems in the world and play a critical role in the ecology and economy of North American shorelines. Credit: Brian Silliman and Mark Bertness, Brown University
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Maintaining availability of high-quality freshwater is regarded by many as the most critical issue facing the 21st century. Researchers are investigating ecological, hydrological and geochemical attributes of streams, rivers, and groundwaters. Credit: Amelia Ward, University of Alabama and Clifford Dahm, University of New Mexico
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