Iraqi technicians at work on oil fields. By 2040, crude will be eclipsed by the rise of the cleaner, more-efficient natural gas as the main source of energy in the Middle East. Haidar Mohammed/AFP
Iraqi technicians at work on oil fields. By 2040, crude will be eclipsed by the rise of the cleaner, more-efficient natural gas as the main source of energy in the Middle East. Haidar Mohammed/AFP