Neodymium - hard to find, horribly polluting, essential to wind turbines:
https://www.hightable.com/natural-resources/insight/braking-wind-wheres-the-neodymium-going-to-come-from-35041
http://bjdurk.newsvine.com/_news/2011/07/04/7011643-hypocrisy-of-wind-energy-exposed-by-greenpeace
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