Grist: The Koch brothers finally took their towering piles of tar-sands oil refinery waste away from Detroit.
But where did they send the stuff? That`s a bit of a mystery.
Huge piles of petroleum coke started building up along the city`s riverfront after a refinery began processing tar-sands oil from Canada in November. Koch Carbon, an affiliate of Koch Industries, peered into the dark mass and saw, ka-ching, opportunity, so it bought up all the waste.
The material has little commercial value in...