If Canada proceeds in exploiting its vast oil sands reserves, it's "game over for the climate," James Hansen writes. Canada’s tar sands contain twice the amount of CO2 emitted by global oil use in all of history, he says; full exploitation plus continuing use of conventional energy sources "would assure that the disintegration of the ice sheets would accelerate out of control... Civilization would be at risk."
If Canada proceeds in exploiting its vast oil sands reserves, it's "game over for the...
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