Third world war will be for Pertol and Water???

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What r the odds for a third world war I heard in a discussion that Third world war 'll be for Pertol or Water.now a days the the two major bones of contention are Petrolium and Water. So what do u think, for which of these two there 'll be third world war. I also think so, once in our college, there was a debate in our classroom and this was the topic. yaar, I think US & Iraq war was only for this.