Tybee Island, Ga., site of an annual sand arts festival, is a popular tourist destination. Local officials worry about a federal proposal to open areas off the coast to oil and gas development. Stephen Morton/Savannah College of Art and Design/AP hide caption

itoggle caption Stephen Morton/Savannah College of Art and Design/AP

An oil well in Garden City, Texas. With prices plunging, oil companies are laying off thousands of workers. Spencer Platt/Getty Images hide caption

itoggle caption Spencer Platt/Getty Images

A functioning oil rig sits in front of the capital building in Oklahoma City, Okla. The oil industry is an important employer in the state, but officials are concerned a technique used to dispose of wastewater from oil extraction is behind a surge in earthquakes here. Frank Morris/KCUR hide caption

itoggle caption Frank Morris/KCUR

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