InsideClimate: Just a day after roughly one million gallons of heavy Canadian crude [3] oil spilled into Michigan's Kalamazoo River in 2010, the National Transportation Safety Board announced it was launching a formal investigation into the incident. It quickly set up shop in a local hotel and conducted dozens of interviews with pipeline workers, local officials and residents. It did field and laboratory analysis of the ruptured pipeline in its own labs. And its investigators pored over the responsible companys...