There is more than EPA, Paul.  an NRDC posting of a letter from the  California State Controller and New York City Comptroller’s offices representing "significant long-term shareowners" (of Rio Tinto).  So, the walk away was yes, EPA, but other political and positionally empowered people are using their power to push their agenda's on another's livelihood.  The NRDC talking points are repeated over and over by many who have little technical understanding and trust others (hope that others ) know what is true of not.