Bloomberg: Tammy Tiedemann remembers the first time she took her kids to the pits. It was 2007. She was 35, a single mom, a Métis with Cree roots and Fort Mac proud: proud of the work she did for Shell Oil, the machines she operated, the toughness and camaraderie on the job, and proud of the mine itself, a monument to humanitys capacity to act on a massive scale, something like the pyramids in reverse.
At the pit mine, 30 miles north of Fort McMurray, in northern Alberta, Tiedemanns 21-year-old son lit...