The Society welcomes open debate, underpinned by sound science, on the subject of climate change. In September 2006, the Royal Society wrote to ExxonMobil to express concern that some of its corporate publications were presenting a misleading view of the scientific evidence about climate change and were over-emphasising uncertainties about what we do and don't know. This letter followed a meeting which had taken place at the request of ExxonMobil where the Society raised concerns about Exxon's position on climate change and the company's funding of lobby groups that misrepresented the science. At the meeting ExxonMobil indicated that it intended to stop funding these organisations. The letter asked for clarification as to when the company would carry out this pledge. Although we have exchanged further letters with ExxonMobil, it has still not addressed this issue.