Calgary Herald: Alberta’s oilsands have taken centre stage in the future of world energy supply, but expansion of the vast resource could be dramatically stunted, a new study has found. The landmark study released Monday by U. S. energy consultancy IHS Cambridge Energy Research Associates says oilsands output could rise to 6.3 million barrels a day by 2035,a nearly fivefold increase above the current level of about 1.8 million. But the report, titled Growth in the Canadian Oil Sands: Finding a …