Rep. Jim Moran, D-VA, and New York City Mayor Michael Bloomberg (L to R) hold a news conference announcing a partnership between Bloomberg Philanthropies and the Sierra Club to push for shutting down coal-fired powerplants and replace them with more environmentally friendly options aboard the Nina Dandy across from the GenOn coal-fired powerplant in Alexandria, Virginia, on July 21, 2011. UPI/Roger L. Wollenberg