This Tuesday, July 10, 2012 aerial photo shows a Nexen oil sands facility near Fort McMurray, Alberta, Canada. On Friday, Dec. 7, 2012, Canada approved China&#x27;s biggest overseas energy acquisition, a $15.1 billion takeover by state-owned CNOOC of Canadian oil and gas producer Nexen. (AP Photo/The Canadian Press, Jeff McIntosh)
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