Even at its peak last year, sales of pillaged oil only accounted for about 40% of the IS budget. See,

As UN Security Council Mulls ISIS Oil Sanctions, Most Funds Still Flow from Saudi and Gulf Donors
http://www.democraticunderground.com/10026192755

economics. And climate change. But say climate change, like the 2003 invasion of Iraq, is irreversible, the economic climate that is driving impoverished youth to Wahhabi schools who promise large sums of money for recruitment, is partly reversible. I'm thinking it is unrealistic (given the bombs bursting in air) to set up soil-redemption and farming, but schools offering scholarships in such learning how to make such endeavors possible in conditions of peace might be. I think it would be best to stay away from education that challenges Wahhabi thought (for now) like teaching girls or history. But to give people a more immediate awareness that there is hope - immediate as in food on the table, the possibility of love and family. Sorry for rambling on...