Pay Dirt: How to Turn Tar Sands into Oil [Slide Show]

FORT MCMURRAY, Alberta--Where does the U.S. get the bulk of the imported petroleum to support its oil addiction? Contrary to popular belief, it's not Saudi Arabia--it's Canada, which supplies the U.S. with more than two million barrels of oil per day, or more than a quarter of all its imported oil. And more than half of that output comes from bitumen melted out of the buried sands of northeastern Alberta--a sprawling deposit of extra-heavy oil underlying more than 142,000 square kilometers, or an area roughly the size of Florida.