The EPA now says there is no more danger of further oil spilling from the ruptured pipeline under the Yellowstone River, but several big questions remain--especially considering that ExxonMobil now says that tar sands oil routinely was carried by the Silvertip pipeline. The issue with that--and with obvious implications for the safety of the proposed Keystone XL tar sands pipeline--is, as Alex Moore of Friends of the Earth says (as have many other campaigners since Friday),
Tar sands can corrode pipelines more quickly, making it more dangerous to transport. If the Silvertip pipeline carried tar sands oil, its corrosive properties could have been a factor in causing the Yellowstone spill.
More on the Yellowstone River Oil Spill
Yellowstone River Oil Spill Spreads 240 Miles - If This Was Keystone XL It'd Be 20 Times Worse
Keystone XL Tar Sands Pipeline Could Have 91 Serious Spills in 50 Years