WHY IT MATTERS: Issues at stake in election - Article Photos 15/40

FILE - In this March 22, 2012 file photo, a pumpjack is silhouetted against the setting sun in Oklahoma City. Americans depend on energy for everything from driving their cars to powering factories, homes and offices _ and of course our smart phones, laptops and tablets. How that energy is produced and where it comes from affect jobs, the economy and the environment. (AP Photo/Sue Ogrocki, File)