According to the latest from the Milwaukee Journal Sentinel, the largest volume flow of tar sands from Canada and North Dakota via pipeline (1.2 million barrels per day), has been approved for operation across Wisconsin by the Wisconsin Department of Natural Resources....on an "air permit". Actually, though the MJS repeatedly referred to the pipeline contents as "oil" in it's online article, diluted bitumen (dilbit), a mixture of tar sands and a proprietary mixture of chemicals to enable tar and sand to flow through both pipelines and pumps is what even Enbridge admits will flow in, and hopefully not spill out of Line 61.
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