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V2G is a no brainer if we really think we will have hundreds of millions of 2 ton electric cars on the road as we do ice vehicles now. Just don't think that that will be even close to enough battery storage to keep up with our current level of energy use after fossil fuels. There will be a big change in lifestyle coming for the middle classes in developed nations.
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We would be much wiser to look one further step ahead than that and realize that owning a personal car for billions of people is completely unsustainable even on the 30 year time frame of what it takes to change everything so OECD civilization can bend back down to something functional without them.
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