HeavyOil-aMajorEnergySourceforthe21stCentury“isthethemeoftheSeventhUNITAR(UnitedNationsInstituteforTrainingandResearch)InternationalConfercnceonHeavyCrudeandTarSandswhichwasheldinBeijinginOct.27-30,with520participantsfrom24countriesandregionsattendingthec Heavy Oil-a Major Energy Source for the 21st Century Century ”istheme of the Seventh UNITAR (United Nations Institute for Training and Research) International Conference on Heavy Customs and Tar Shs Basically held in Beijing in October. 27-30, with520participantsfrom24 countries andregionsattendingthec