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.I've read that a solar array the size of Rhode Island could supply the US's energy needs. Phoenix & the sunbelt may not be so bad off when everything shakes out...
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.Just a clarification: it is not the electrical engines themselves that are problematic (making tremedously powerful electric engines really isn't all that complicated), it's just that alternative sources for the required electricity are not currently practical. There's nothing impossible about it (there are, for example, current military subs that can run purely on fuel cells), it's just expensive and complicated.
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.In production, actually, and with several export contracts.
As far as airplanes are concerned, electric motors are nowhere near the practical thrust to weight/size ratio, and neither are the fuel cells.In general, quite true (and likely to remain that way for decades). Although, again, I suspect the problem is the weight/size of batteries/fuel-cells - I suspect an electric motor could easily replace a turboprop, if you could find some light way to power it. Also...
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Then I could have chicken teriyaki donburi, the meal of the gods, every night.
posted by Heywood Mogroot at 6:27 PM on April 7, 2005