A scholarly paper explaining why predictions made by climate computer models used by the United Nations’ Intergovernmental Panel on Climate Change (IPCC) tend to exaggerate global warming has ignited a political firestorm. Dr. Wei-Hock “Willie” Soon, a solar physicist at the Harvard-Smithsonian Center for Astrophysics, came under attack by environmentalists after co-authoring a peer-reviewed paper explaining “the widening discrepancy between prediction and observation” in climate change models, and members of Congress soon took sides. The scientific paper, entitled “Why Models Run Hot,” concludes that the computer models overstated the impact of CO2 on the climate: “The impact of anthropogenic global...