| http://www.w3.org/ns/prov#value | - Journal petroleum is getting more expensive to dig up and process, as a function of more marginal types of deposits (oil shale, tar sands, etc), and just plain deeper to get toat the same time, india, brazil, china: approaching western standards of lifestyle and energy consumptionthis is a simple economic equation: decreasing supply, increasing demand, which means the age of cheap easy petroleum i
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