A dam predicament
Around the world, freshwater species are disappearing at an alarming rate: Since 1970 their populations have decreased by 84% on average—a staggering drop representing the magnitude of the damage that has been done to freshwater ecosystems. Free-flowing rivers, in particular, have been hard-hit, and dams are one of the biggest threats. The wrong dam in the wrong place can have profound consequences: Dams alter water flows, block fish migration routes, devastate the habitats of endangered species, and trap nutrient-rich sediment needed to replenish downstream deltas. Globally, the number of ...
Source: worldwildlife.org