Oil Reserves: Proven oil reserves are deposits of crude oil in the ground that geological and engineering data have demonstrated with reasonable certainty could be extracted using existing technology. Data for Canada include the unconventional oil held in the oil sands, which are more expensive to access. Most of the largest oil-holding countries are members of the Organization of Petroleum Exporting Countries (OPEC) and directly control their reserves through state-owned companies. If world oil demand grows, we all will be more dependent on oil from the most oil-rich countries.
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