A gift to Detroit from Canada's tar sands fields.
Detroit’s Petroleum Coke PilesFacebook pageA gift to Detroit from Canada’s tar-sands operators.

A riverside refinery that has operated in Detroit since the 1930s began refining a new type of oil in November: tar-sands oil from Canada.

In the few short months since it began handling the Canadian oil, the refinery has already spewed out a three-story mountain of black waste covering an area the size a city block. That mountain is still growing, and it is not covered with anything to prevent tiny carbon particles from blowing over the city.