“Look at the energy efficiency of this.” John Zamick, 57, stands beneath a single wind turbine in a field near Swindon. “I stand here in awe. This is unbelievable magic. It’s money from thin air.” “Thick air,” says his colleague, Bob Carnell, 60. Unabashed, Zamick continues. “That tower is 40 tons of steel. But it’s an eggshell. It’s 10mm thick at the top, at the bottom, 20mm.”
http://www.theguardian.com/environment/2015/jun/12/trouble-in-the-air-for-wind-power-players
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