A flag bearing the logo of Royal Dutch Shell flies outside the head office in The Hague, Netherlands. The energy company said Wednesday that it has agreed to buy gas producer BG Group for $70 billion.
Yemenis walk past near oil tankers that were burnt during clashes between Shiite Houthi rebels and their opponents in the capital, Sanaa, in September. Saudi Arabia launched airstrikes this week to counter the Houthis' offensive.
Mohammed Huwais/AFP/Getty Images
A platform owned by Mexico's state-run oil company Pemex is seen off the Bay of Campeche in the Gulf of Mexico. The country has recently opened up its energy sector to foreign investors.
A pump-jack sits atop an oil well near downtown Sidney, Mont. The oil boom has brought thousands of new residents to the town, almost all of whom work in the Bakken oil fields in Montana and North Dakota. Sidney sits at the western edge of the Bakken oil patch, one of the most productive drilling areas in the country.
Drilling rigs dot the landscape near Calumet, Okla., in April 2013. Oklahoma's economy blossomed during the domestic fracking boom, but as the price of crude oil drops, that could change.
Libya's oil terminals — like the Brega refinery and oil terminal, pictured in March 11, 2014 — are being fought over by militias and by the nation's two rival governments. The conflict is drying up production, and may have a devastating impact on the nation's battered economy.
Abdullah Doma/AFP/Getty Images