Electricity. We already have the technology for electric cars (i.e. motors) - we just don't have ample storage or generation technology yet.
Either there will be a breakthrough for storage or a new type of electricity generation device.
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DD summer/winter: 2000 Boxster S
DD spring/fall: 914-6 w/ 3.0L SC Dual Webers (For Sale)
http://imgur.com/a/k0Wtl - My 914-6 Build/Project Story
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