An efficient modern wind turbine uses at least 82kg of neodymium. Older designs use much more. http://www.vestas.com/en/about-vestas/sustainability/sustainable

An efficient modern wind turbine uses at least 82kg of neodymium. Older designs use much more. http://www.vestas.com/en/about-vestas/sustainability/sustainable-products/life-cycle-assessment/rare-earth-elements.aspx http://www.vestas.com/en/about-vestas/sustainability/sustain... http://pubs.usgs.gov/sir/2011/5094/pdf/sir2011-5094.pdf http://pubs.usgs.gov/sir/2011/5094/pdf/sir2011-5094.pdf