Scientists published the first global survey of the known undersea freshwater reserves. Water is relatively cheap now, but the reserves could be valuable if it becomes scarcer in the future. Olivier Morin/AFP/Getty Images hide caption

itoggle caption Olivier Morin/AFP/Getty Images

Demonstrator China Starshine holds up signs outside of City Hall in Portland last week. Ross William Hamilton/The Oregonian/AP hide caption

itoggle caption Ross William Hamilton/The Oregonian/AP