Aan oil spill from the Belle Fourche Pipeline that was discovered Dec. 5, 2016 in Ash Coulee Creek, a tributary of the Little Missouri River, near Belfield, N.D. Authorities say the pipeline spill is now believed to be one of the biggest in state history. (Scott Stockdill/North Dakota Department of Health via AP)

Companies Slated To Build Tar Sand Pipelines Have Spilled 63,000 Barrels Since 2010

Oil giants TransCanada, Kinder Morgan and Enbridge have together suffered 373 spills over the past seven years.