简介：Asearlyasinthe1960ssomepeoplehadpredictedthatcrudeoilwoulddepletesoon.Nevertheless,bytheendof1999theworldprovenreservesofremainingconventionaloilamountedto139.2billiontons.Theworldconsumedabout3.462billiontonsofoilin1999.Inaddition,thereexistsizablereservesofnon-conventionaloil(heavyoilsandsuper-heavyoils).
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