There are a number of environmentally destructive effects of tar sand oil production. First, the amount of fresh water it takes to mine oil sands is equivalent to TWICE the amount of water Calgary, Canada uses PER YEAR and 90% of that water ends up in extremely toxic tail ponds; the water is so toxic, the mining facility in Alberta uses a propane canon to prevent birds from landing on it. And the tailing ponds, which are man made structures, are 50 kilometers wide! Processing the tar sand also consumes enough natural gas every day to heat 3 million homes while the process itself releases THREE TIMES MORE greenhouse gas emission per barrel of oil produced compared to conventional oil.
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