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According to the text, extracting oil from the Canadian tar sands
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"This challenge" in "This challenge will have a longer term effect on our economies..." (lines 43-44) refers to the
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In paragraph 7 (lines 40-50), Sir David King's main comment is that
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In the text, 'contradictory estimates of oil reserve data available in the public domain.' (lines 38-39) refers to the fact that