Stephen Lacey has a short but powerful post at Grist that dramatically illustrates "what happens when you turn a carbon sink like the Boreal Forest into a carbon-spewing pit of tar sands." It's not a pretty picture - literally - as you can see below.
For more information on the destruction that Canadian tar sands mining causes, click here. For instance, it "releases at least three times the CO2 emissions as regular oil production and is slated to become the single largest industrial contributor in North America to Climate Change." None of which, we'd point out, is an issue with solar, wind, energy efficiency, and other forms of clean, renewable energy.