September 26, 2002 Retiring Senior Scientist for the Office of the U. S. Global Change Research Program, Michael MacCracken writes a letter to ExxonMobil’s Lee Raymond in response to criticism of the National Assessment and U.S. climate science in ExxonMobil advertising as well as the ExxonMobil fax from on February 6, 2001 from Randy Randol to John Howard of the Council on Environmental Quality.