The U.S. State Department has extended the public comment period on a proposal to nearly double the amount of crude oil that's shipped in a pipeline along Lake Superior.
Enbridge Energy’s Line 67, also known as the “Alberta Clipper” pipeline, runs from the tar sands region in Canada down to Wisconsin near Lake Superior. In the US, it's more than 300 miles long and three feet in diameter.
Right now, Enbridge Energy ships 450,000 barrels a day through the pipe. The company wants to ramp up to 880,000 barrels per day by 2015.