Provenance
Handout written by Prajukti Bhattacharyya, University of Wisconsin-Whitewater, with images from USGS Fact Sheet 087-02 (http://pubs.usgs.gov/fs/2002/fs087-02/) and US Department of Energy Critical Materials Strategy, 2011 (http://energy.gov/sites/prod/files/DOE_CMS2011_FINAL_Full.pdf), data from Standard Specifications for Permanent Magnet Materials, published by Magnetic Materials Producers Association, (http://www.smma.org/pdf/permanent-magnet-materials.pdf) and excerpts from Renee Cho, Sept. 19, 2012, Rare Earth Metals: Will We have Enough?, State of the Planet: Blogs from the Earth Institute, (http://blogs.ei.columbia.edu/2012/09/19/rare-earth-metals-will-we-have-enough/) and David Biello, Oct. 13, 2010, Rare Earths: Elemental Needs of the Clean-Energy Economy, Scientific American (http://www.scientificamerican.com/article.cfm?id=rare-earths-elemental-needs-...).

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