The debate over climate change is often a contentious one, and key players in the discussion only rarely switch sides. But late last month, Lennart Bengtsson, the former director of the Hamburg-based Max Planck Institute for Meteorology, one of the world's leading climate research centers, announced he would join the academic advisory council of the Global Warming Policy Foundation (GWPF). GWPF, based in Britain, is a non-profit organization and self-described think tank. Conservative politician Nigel Lawson founded the organization in 2009 in order to counteract what he considered to be an exaggerated concern about global warming. The organization uses aggressive...