Sen. Mary Landrieu, D-La., chair of the Senate energy committee, spoke Wednesday about getting congressional approval for the Canada-to-Texas Keystone XL pipeline. With her is Sen. Joe Manchin, D-W.Va., a member of the committee. J. Scott Applewhite/AP hide caption
Democratic U.S. Sen. Mary Landrieu of Louisiana walks through the U.S. Capitol on Wednesday. Congress returned to work following last week's midterm elections break. Landrieu is locked in a runoff with Republican Rep. Bill Cassidy. Mark Wilson/Getty Images hide caption
Beacon Power President and CEO Barry Brits, at the company's plant in Hazle Township, Pa. He says a loan from the Department of Energy made it possible for his company to develop its flywheel energy storage technology. Jeff Brady/NPR hide caption
Chinese President Xi Jinping and President Obama, seen here during a ceremony at the Great Hall of the People in Beijing, announced pledges to reduce greenhouse gases. HUANG JINGWEN/Xinhua /Landov hide caption
A section of a bike path that uses solar cells to produce electricity is opening for full-time use Wednesday. SolaRoad hide caption
Oil, carried here by the Trans-Alaska Pipeline, is fundamental to the state's economy. But Alaskans also face the effects of climate change in their daily lives. Al Grillo/AP hide caption
Chevron Corp. supported several candidates in Richmond, Calif., where the company has been hoping to modernize a large oil refinery, seen here in 2010. None of the Chevron-backed candidates were elected. Paul Sakuma/AP hide caption
One proposed solution for New England's energy price spike problem: Importing more liquefied natural gas and feeding it into the pipeline network on the other side of the region's bottleneck. Sam Evans-Brown/New Hampshire Public Radio hide caption
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
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
A man sells products by candlelight at a grocery during a blackout in Dhaka, Bangladesh, on Saturday. Shariful Islam/Xinhua/Landov hide caption
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
Gas prices below $3 per gallon add up to big savings for consumers. Rich Pedroncelli/AP hide caption
Macy Gould shared this photo from Lexington, Ky., where the gas prices are under $3. Macy Gould/Instagram hide caption
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
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
Workers drill for oil in the Bakken shale formation outside Watford City, N.D., an area experiencing an oil boom. Andrew Burton/Getty Images hide caption
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