Greenpeace has revealed that two prominent climate skeptics made themselves available for hire by the hour to write reports that cast doubt on man-made climate change and the impacts of global warming. Members of Greenpeace posed as consultants for fossil fuel companies and asked William Happer, a professor at Princeton University, and Frank Clemente, a retired professor from Penn State University, to write the reports. Both professors said the reports would cost thousands of dollars to write and discussed ways to obscure the funding source.