| http://www.w3.org/ns/prov#value | - Further, should the figure ever start declining, the resulting price increase should make it worthwhile for oil producers to extract more oil from old fields (only a fraction of the oil in each field is extracted at present) and look at other expensive substitutes such as shale oil - ...To continue reading this article, subscribe to receive access to all of newscientist.com, including 20 years of
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