I know its a little late for these suggestions, but I think that there should be a minor wonder called OPEC.
You must control at least 5 (or more depending) oil resources to build this wonder. All civs with OPEC are immediatly allied to each other. Decisions to sell oil to another country must be taken unanimously to be passed. This would work like the UN Council. You could cut down on the amount of oil, or increase it. There would then be arguments over who should cut down on the oil selling (and also hurt their imports) and who shouldn't. This could then lead some other OPEC countries to bribe or promise more trade or aid to make them cut down.
You must control at least 5 (or more depending) oil resources to build this wonder. All civs with OPEC are immediatly allied to each other. Decisions to sell oil to another country must be taken unanimously to be passed. This would work like the UN Council. You could cut down on the amount of oil, or increase it. There would then be arguments over who should cut down on the oil selling (and also hurt their imports) and who shouldn't. This could then lead some other OPEC countries to bribe or promise more trade or aid to make them cut down.
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