| Message | It's inevitable that cars of the future will have to be powered by something other than petroleum-based gas.  However, you don't have to worry about this for a long time.  In addtion to finding alternative engines that are electric, hydogen, etc -- there are many efforts to find renewable sources of non-petro gas (corn, many others). As long as there's 100 million (wild ass guess) gas cars on this planet, there's going to be a lot of motivation to find someting to put in them. 
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