| http://www.w3.org/ns/prov#value | - artel's oil will drop periodically until 2017, before rebounding slightly in 2018.The biggest challenge is rapid expansion of non-OPEC supply due to shale oil and the corresponding decline of OPEC oil, said Carsten Fritsch, senior commodity analyst at Commerzbank.The boom in gas, and to a lesser extent oil, extracted from shale rock found around the world, but especially in north America, has sl
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