A worker installs solar panels atop a government building in Lakewood, Colo. The industry has added more than 80,000 jobs since 2010, according to The Solar Foundation. John Moore/Getty Images hide caption

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An oil and gas facility in Roger Mills County in far-western Oklahoma. The governor is warning state agencies that low oil prices could stall the state economy. Joe Wertz/StateImpact Oklahoma hide caption

itoggle caption Joe Wertz/StateImpact Oklahoma

An excavator loads a truck with oil sands at the Suncor mine near the town of Fort McMurray in Alberta, Canada in 2009. Environmental groups that oppose oil sands mining have pointed to delayed and canceled projects as a sign of recent success. Mark Ralston/AFP/Getty Images hide caption

itoggle caption Mark Ralston/AFP/Getty Images