When you consider the way regulations are enforced against tar sands companies in Canada compared to the 'States, it makes you wonder! Details here.
(Right) The tar sands at night. 24 hours a day, the tar sands eat into the most carbon-rich forect ecosystem on the planet. Storing almost twice as much carbon per hectare as tropical rainforests, the boreal forest is the planet's greatest terrestrial carbon storehouse. To the industry, these diverse and ecologically significant forests and wetlands are referred to as "overburden," the forest to be stripped & the wetlands dredged & replaced by mines & tailings ponds so vas they can be seen from outer space. Photo credit - Huffington Post