An oil well in Garden City, Texas. With prices plunging, oil companies are laying off thousands of workers. Spencer Platt/Getty Images hide caption

itoggle caption Spencer Platt/Getty Images

Without horsepower, they rely on human power: Mother and daughter-in-law Sheela and Sunita Devi shred sugarcane into feed. Ibrahim Malik for NPR hide caption

itoggle caption Ibrahim Malik for NPR

Iranians commemorate the 36th anniversary of the Islamic Revolution near the Azadi Tower in Tehran on Wednesday. While many Iranians would like to reorder relations with the West, there's also plenty of skepticism about whether it will actually happen. Ebrahim Noroozi/AP hide caption

itoggle caption Ebrahim Noroozi/AP

A functioning oil rig sits in front of the capital building in Oklahoma City, Okla. The oil industry is an important employer in the state, but officials are concerned a technique used to dispose of wastewater from oil extraction is behind a surge in earthquakes here. Frank Morris/KCUR hide caption

itoggle caption Frank Morris/KCUR

House Energy and Commerce Committee Chairman Fred Upton, R-Mich., left, clasps hands with Sen. John Hoeven, R-N.D., sponsor of the Senate's Keystone XL pipeline bill version, on Wednesday as lawmakers gather to urge President Obama to sign the legislation approving expansion of the Keystone XL pipeline. The House passed the Senate's version of the bill Wednesday afternoon. J. Scott Applewhite/AP hide caption

itoggle caption J. Scott Applewhite/AP

The eruption of Mount Pinatubo in the Philippines in 1991 spewed almost 20 million tons of sulfur dioxide into the atmosphere, causing worldwide temperatures to drop half a degree on average. Arlan Naeg/AFP/Getty Images hide caption

itoggle caption Arlan Naeg/AFP/Getty Images

Elizabeth Ebinger in Maplewood, N.J., bought her solar panels, while neighbor Tim Roebuck signed a 20-year lease. Both are happy with the approach they took, and both are saving money on energy bills. Jeff Brady/NPR hide caption

itoggle caption Jeff Brady/NPR

Tracy Perryman is production manager for his family's small oil company in Luling, Texas. B.J.P. Inc. owns 116 wells that, combined, produce about 100 barrels a day. John Burnett/NPR hide caption

itoggle caption John Burnett/NPR

Traffic moves along Route 21 in downtown Newark, N.J., where a gas station lists the price for regular unleaded gasoline at $1.72. Julio Cortez/AP hide caption

itoggle caption Julio Cortez/AP

The price of jet fuel has dropped, but airlines are still adding fuel surcharges to the price of many tickets. Many other industries that use large amounts of fuel, like shipping and delivery services, have also maintained extra fuel fees. Nam Y. Huh/AP hide caption

itoggle caption Nam Y. Huh/AP