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Bucky Fuller (As Craig Vetter calls him) had some great concepts. But most of our efficieny gains have already been realized. Tom Murphy estimates we could see another 30% eventually in the mid future.
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If we could get that done by 2050 when our energy consumption is predicted to double again, We would still need 14TW continuous average.
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Then there is also Jevon's paradox which shows that for every gain in efficiency, we tend to create a new gadget or service which we adopt in addition to what already have that increases our ebergy consumption even further.
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