by Larry Powell It's hardly surprising that Big Oil is already brandishing the latest scientific study on the Alberta oil-sands as a weapon in its crusade to peddle bitumen to the world. The study was done by a noted Canadian climatologist, Andrew Weaver and a colleague at the University of Victoria. This is the part Big Oil likes. If all of the oil-sand's reserves considered "economically viable" were developed, the resulting rise in global temperatures would be "almost undetectable," when compared to massively larger, global deposits of coal. But there are other parts of the study you won't hear Big Oil quoting. For example, what if all o f the tarsand's reserves known to be there, (known as "oil-in-place and seven times larger than Saudi Arabia's ) are developed, over time? In that case, Earth's temperature would rise up to ten times as much as in the last scenario! And that would represent almost half of the man-ma