When we all cramped down on the Fur trade, indians in Canada lost their lively hood. They gave their land and stopped their objection for the Oil company's intention of extracting oil out of tar sands.
the extraction of oil from tar sands use one barrel of oil for two barrels of oil. Since the price of oil has gone up this is viable economically. But the amount of CO2 which is produced in this process is unbelievable.
This process generates two to four times the amount of greenhouse gases per barrel of final product as the production of conventional oil.[3] If combustion of the final products is included, the so-called "Well to Wheels" approach, oil sands extraction, upgrade and use emits 10 to 45% more greenhouse gases than conventional crude.[
Says the Wikipedia
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