The United States' oil dependence on Canada, already America's largest supplier, is about to grow under a plan to build a new pipeline to transport oil from the tar sands of Alberta into the central part of the nation. TransCanada Corporation, a public company traded on the New York Stock Exchange, has announced the TransCanada Keystone Pipeline has been given a final Environmental Impact Statement approval from the U.S. Department of State because of the limited adverse environmental impacts that are expected. The approval is the result of nearly two years of analysis of the project proposal by more than...