Climate Central: It's official: Last year was Australia's hottest on record. As temperatures go up Down Under, so do concerns about how to keep rivers cool in a warming world. Ironically, the soundest solution could mean tapping into what has long been considered a pollutant.
Dams have long been vilified for blocking fish migrations. But the deep reservoirs of dammed water do something free-flowing rivers can't: stratify so that the cooler layers settle to the bottom.
Until recently, scientists only studied...