Dams

Long-deferred maintenance, a changing climate and the construction of homes, businesses and highways below previously remote dams are all contributing to the soaring numbers.

As Cambodia kicks off a three-day water festival, fishermen are struggling to make a living in the face of climate change and hydropower dams.

Biologists think gulls are eating more juvenile salmon than they thought, and fish advocates are proposing to kill problem gulls. But opponents say dam modification is what's needed to protect salmon.

Reports say three of those arrested were involved in getting the mining project licensed, and two were consultants with a company that certified the dam for safety.

The College Lake Dam has been strained by heavy rainfall. Overnight, worries about its imminent collapse sent alarm through the community.

Hundreds of millions of beavers used to populate the West but were hunted to near extinction. Turns out, beavers are critical to healthy water ecosystems, so now there are efforts to bring them back.

A report by the United Nations Environmental Programme offers recommendations to stop the failure of dams holding mine waste. Will governments and industry leaders sign on?

Thousands are being displaced by new dam construction. "I cannot leave my ancestors here," says a woman whose village will be submerged by the dam. "If I abandon them, I won't know who I am."