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POPSGeneral Motors builds massive rooftop solar array This is the type of high profile event that could represent a tipping point. Someday, i imagine that all rooftops will be solar powered - and many cars too for that matter - and this type of announcement could be looked at as a catalyst for many more companies to get in the game. Unfortunately, the U.S. government isn't being nearly as supportive of wind and solar as European and Asian governments - but again, that's something that will hopefully change after the upcoming election.