WASHINGTON, D.C. — Maj. Gen. Merdith "Bo" Temple, U.S. Army Corps of Engineers Deputy Commanding General (left), Lisa P. Jackson, EPA Administrator (center), and The Hon. Jo-Ellen Darcy, Assistant Secretary of the Army (Civil Works), share ideas during the EPA Earth Day event on the National Mall here, April 16, 2011. (U.S. Army Corps of Engineers photo by John Hoffman)