"Steffen, William"@en . "Will Steffen"@en . . . "Climate change scientist" . . "Will Steffen (born 1947) is an American chemist. He was the executive director of the Australian National University (ANU) Climate Change Institute and a member of the Australian Climate Commission until its abolishment in September 2013. From 1998 to 2004, he was the executive director of the International Geosphere-Biosphere Programme, a co-ordinating body of national environmental change organisations based in Stockholm."@en . . . . . "1947Z"^^ .