EcoWatch: The oil spill that shut down a portion of the Keystone 1 pipeline in South Dakota last weekend is much bigger than initially estimated, TransCanada admitted on Thursdayalmost 100 times bigger, in fact. The fossil fuel company said the potential volume of the spill in Freeman, discovered by a passerby on Saturday, was about 18,600 gallons, or 400 barrels. That estimate comes just days after TransCanada initially claimed the spill totaled about 187 gallons, or approximately 4.5 barrels. The...