 Analysis of U.S.-led airstrikes on Islamic State targets in Iraq and Syria finds the group’s ability to exploit oil for a source of revenue has been diminished. Analysis published Friday by the Energy Intelligence Group estimates around 4,000 air sorties launched by U.S. forces and their allies have knocked out about half of the refinery capacity captured by the group calling itself the Islamic State. “Air power alone will not defeat Islamic State, but it has dealt the jihadists’ oil industry a significant blow,” the report said. The terrorist group in control of parts of Syria and Iraq is said to be generating about $2 million per day on pilfered oil. Iraqi leaders and peace advocacy groups have said action must be taken to contain oil’s role in IS […]