One of the great technological advances that brought us not simply the modern age but basic civilization itself was the ability to capture energy from moving water and air via watermills and windmills in order to grind grains into flour. We now manage said grinding with electric mills. In a world suffering circumscribed access to the basic energy inputs that generate electricity, good luck maintaining not simply an industrial lifestyle, but a post-waterwheel lifestyle. Think all the way back to the first chapter. How many of the world’s varied geographies have good geographies for waterwheels?
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