Climate ResearchThree editors of the journal Climate Research resigned last week over a published paper claiming that current global warming falls within the range of natural variability. The finding was seized upon by some conservative US politicians, but has been attacked by climate researchers. Critics questioned the methods used by the authors - astronomers Willie Soon and Sallie Baliunas of the Harvard-Smithsonian Center for Astrophysics in Cambridge, Massachusetts - to compare proxies for climate change such as tree-ring growth (W. Soon and S. Baliunas Clim. Res. 23, 89–110; 2003).