Ray Gerrish repairs a drilling rig near Watford City, N.D. Oil industry analysts predict that oil prices will have to remain low for at least several months before having a significant effect on U.S. production. Jim Gehrz/MCT/Landov hide caption

itoggle caption Jim Gehrz/MCT/Landov

Pumpjacks at the Inglewood oil fields in California in March. Some of the most controversial methods of oil extraction, like fracking, oil sands production and Arctic drilling, are also expensive. That's made them less profitable as the price of oil continues to fall. Richard Vogel/AP hide caption

itoggle caption Richard Vogel/AP

A customer walks past a sales counter in a shopping mall during a blackout in Dhaka, Bangladesh, Saturday. Bangladesh was hit by a nationwide blackout on Saturday after a transmission line bringing electricity from neighboring India failed. A.M. Ahad/AP hide caption

itoggle caption A.M. Ahad/AP

Lynn Good has had many mentors throughout her career — but few of them were women. "So I'm generationally on the early part of the ascent of women into leadership roles," the Duke Energy president and CEO says. Pat Sullivan/AP hide caption

itoggle caption Pat Sullivan/AP

Sales of traditional hybrids, plug-ins and all-electric cars are down about 5 percent in 2014 — while truck and SUV sales have jumped. Mark Ralston/AFP/Getty Images hide caption

itoggle caption Mark Ralston/AFP/Getty Images

Saudi Arabia's oil minister, Ali Al-Naimi, shown in Kuwait last month, has played down the drop in oil prices. The country continues to pump oil at high levels, saying it wants to preserve its market share. But this has also contributed to a 25 percent drop in oil prices since June. Yasser Al-Zayyat/AFP/Getty Images hide caption

itoggle caption Yasser Al-Zayyat/AFP/Getty Images

A fireball goes up at the site of an oil train derailment in Casselton, N.D., in this Dec. 30 photo. The fiery crash left an ominous cloud over the town and led some residents to evacuate. Bruce Crummy/AP hide caption

itoggle caption Bruce Crummy/AP