Editor's note: This is Part 2 of a two-part series. Read Part 1. Last time, we looked at the coming revolution in automotive technology: the switch from internal-combustion power to hybrid power and, eventually, to straight electric vehicles. This time, we'll take a closer look at both the pros and cons of electrics, which hold such huge promise for a cleaner, quieter and more eco-friendly environment. In order to appreciate how profound this change will be, though, a bit of nuts-and-bolts background is in order. One basic way of seeing how well a machine works is by looking at its thermal efficiency, which is simply the percentage of input energy that's turned into useful work. The early steam locomotives of the 1840s -- the first motive power that didn't depend on wind, water...
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