NAFTA body calls for investigation into oilsands tailings enforcement | Edmonton Journal: "Studies have suggested the ponds leak water containing tailings from oilsands production into the Athabasca River.Even without including clean-up costs, the tarsands are negative net-energy. There are trillions of dollars already invested in autosprawl, all depending on energy in liquid form.
The ponds are estimated to hold 1.3 trillion litres of contaminated water."
Now, if you add in the clean up. It is easy to see that it would have been better to invest in buses.