Europe is the world's biggest fan of wind energy, a rapidly growing industry that is likely to continue to dominate the renewable energy market for some time. But other parts of the world, notably China, are catching up fast.
Today, wind turbines dot parts of the horizon in most of the developed world and in a growing part of the developing world.
It is unclear exactly how many there are - there is no global or even European registry - but a rough estimate brings their number to 3...
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