In December 2009, after the Climatic Research Unit email controversy, Singer wrote an opinion piece for Reuters in which he said the scientists had misused peer review, pressured editors to prevent publication of alternative views, and smeared opponents. He said the leaked e-mails showed that the "surface temperature data that IPCC relies on is based on distorted raw data and algorithms that they will not share with the science community." He argued that the incident exposed a flawed process, and that the temperature trends were heading downwards even as greenhouse gases like CO2 were increasing in the atmosphere. He wrote: "This negative correlation contradicts the results of the models that IPCC relies on and indicates that anthropogenic global warming (AGW) is quite small," concluding "and now it turns out that global warming might have been 'man made' after all." A British House of Commons Science and Technology Select Committee later issued a report that exonerated the scientists,