WASHINGTON, DC - MARCH 19:  Prince Charles, Prince of Wales gives a speech at an Exceptional Leadership in Conservation Reception hosted by the International Conservation Caucus Foundation (ICCF) at Andrew Mellon Hall on the third day of a visit to the United States on March 19, 2015 in Washington, DC. The Prince and Duchess are in Washington as part of a Four day visit to the United States.  (Photo by Chris Jackson/Getty Images)