In Taking Economic War to Islamic State, U.S. Developing New Tools By REUTERS Since last month, U.S. warplanes have struck Islamic State’s oil infrastructure in Syria in a stepped-up campaign of economic warfare that the United States estimates has cut the group’s black-market earnings from oil… Published: November 24, 2015 at 02:25AM via NYT Business Day http://ift.tt/1SgNLJ3