In 2007, he received the 10th annual Global Environmental Citizen Award from the Harvard Medical School's Center for Health and the Global Environment, the director of which, Eric Chivian, stated: "For decades the Prince of Wales has been a champion of the natural world ... He has been a world leader in efforts to improve energy efficiency and in reducing the discharge of toxic substances on land, and into the air and the oceans". Charles's travels by private jet drew criticism from Plane Stupid's Joss Garman.