Canada's plans to mine more of its oil sands have just sunk deeper into the political mire. A new report saying that millions of migratory birds are at risk adds to a mass of criticism of the damage caused by exploiting the oil sands.rnThe thick tarry deposit in northern Alberta is the world's second-largest oil reserve after Saudi Arabia, but separating the useable oil from the gunk takes three times as much energy asrnpumping conventional oil. This alone makes it some of the "dirtiest" oil on the planet.rnThis week, a report by the US Natural Resources Defense Council says that continued development of the area could kill 100 million migratory birds over the next 50 years, mainly by destroying their habitat.
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