ShellNo flotilla participants float near the Polar Pioneer oil drilling rig during demonstrations in May against the presence of the first of two Royal Dutch Shell oil rigs in the Port of Seattle. David Ryder/Getty Images hide caption

itoggle caption David Ryder/Getty Images

Gary Matli, a field supervisor with the Oklahoma Corporation Commission, inspects a disposal well located east of Guthrie, Okla. Joe Wertz/StateImpact Oklahoma hide caption

itoggle caption Joe Wertz/StateImpact Oklahoma

The Antarctic ice sheet stores more than half of Earth's fresh water. Scientists wondered how much of it would melt if people burned all the fossil fuels on the planet. UPI /Landov hide caption

itoggle caption UPI /Landov

Kevin Murphy says he is proud of what he and the other workers do at the Rosebud mine, including digging the coal and reclaiming the land afterward. Amy Martin/Montana Public Radio hide caption

itoggle caption Amy Martin/Montana Public Radio

A wind farm in Montezuma Hills, about 40 miles northeast of San Francisco. California is considering proposals to, among other things, derive half the state's electricity from renewable sources. Carl Costas/CALmatters hide caption

itoggle caption Carl Costas/CALmatters