| http://www.w3.org/ns/prov#value | - The result is a continued fall in U.S. oil imports (currently at 20% of its needs) to the extent that North America becomes a net oil exporter around 2030.This major shift will be driven by the faster-than-expected development of hydrocarbon resources locked in shale and other tight rock that have just started to be unlocked by a new combination of technologies called hydraulic fracturing.Accord
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