I predict that Sunbelt states like Arizona and Nevada will become significantly depopulated, since the region will be short of water as well as gasoline and natural gas. Imagine Phoenix without cheap air conditioning.
The point is that trucks, ships and airplanes run on oil, not electricity. Noone has figured out a way to power them with electric motors yet, and when they do, we will have to scrap all of them and build the electric ones, using oil.
Every single calorie we eat is backed by at least a calorie of oil, more like ten. In 1940 the average farm in the United States produced 2.3 calories of food energy for every calorie of fossil energy it used. By 1974 (the last year in which anyone looked closely at this issue), that ratio was 1:1. And this understates the problem, because at the same time that there is more oil in our food there is less oil in our oil. A couple of generations ago we spent a lot less energy drilling, pumping, and distributing than we do now. In the 1940s we got about 100 barrels of oil back for every barrel of oil we spent getting it. Today each barrel invested in the process returns only ten.
David Pimentel, an expert on food and energy at Cornell University, has estimated that if all of the world ate the way the United States eats, humanity would exhaust all known global fossil-fuel reserves in just over seven years. Pimentel has his detractors. Some have accused him of being off on other calculations by as much as 30 percent. Make it ten years.
Germany is experimenting with fuel cells [for submarines], but that's all so far.
As far as airplanes are concerned, electric motors are nowhere near the practical thrust to weight/size ratio, and neither are the fuel cells.
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