RIO DE JANEIRO and LONDON—A call for action on global health has been made in an article published by The Lancet medical journal about the United Nations Conference on Sustainable Development held in Rio de Janeiro. Issues which degrade the planet also degrade human health, according to Professor Sir Andy Haines, OBE, of the London School of Hygiene & Tropical Medicine. He talks with Peter Goodwin about the positive actions to be made to help both the planet and public health.