Charles G Koch Foundation, a leading provider of funds for climate sceptic groups, gave Soon two grants totalling $175,000 (then roughly £102,000) in 2005/6 and again in 2010. In addition the American Petroleum insitute (API), which represents the US petroleum and natural gas industries, gave him multiple grants between 2001 and 2007 totalling $274,000, oil company Exxon Mobil provided $335,000 between 2005 and 2010, and Soon received other grants from coal and oil industry sources including the Mobil Foundation, the Texaco Foundation and the Electric Power Research Institute.