Sustainable dams -- are they possible?

Humans have been altering natural waterways for centuries, but only in the last several decades have dams raised ecological concerns.N. LeRoy Poff, professor of biology at Colorado State University, studies the ecological impact to rivers from human-caused changes, such as dam building, and how these modified river systems can be managed for resilience.In a Perspective piece in the journal Science, Poff writes on the state of research in sustainable dam design.

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