revision preference src: He has been an outspoken critic of numerous environmental advocacy groups. From July 2005 to late 2008, critic was the critic of the Australian Environment Foundation, a group that has links to the politically conservative Institute of Public Affairs. <SEP> tgt: He has been an outspoken critic of numerous environmental advocacy groups. From July 2005 to late 2008, Burke was the Chair of the Australian Environment Foundation, a group that has links to the politically conservative Institute of Public Affairs.