| http://www.w3.org/ns/prov#value | - oom in gas and oil extracted from shale rock found around the world, but especially in North America, has slashed energy costs for many consumers.OPEC meanwhile maintains that it has a key role to play in meeting the world's thirst for crude oil.Pumping about 35 percent of the world's crude, the cartel will also decide in Vienna on whether to replace Abdullah El-Badri as secretary general.Saudi Ar
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