At its sixteenth session in November 2007 , the Committee on Sustainable Energy directed the Ad Hoc Group of Experts on Harmonization of Fossil Energy and Mineral Resources Terminology ( now the Expert Group on Resource Classification ) to submit any revised United Nations Framework Classification for Fossil Energy and Mineral Resources ( UNFC ) for consideration by the Extended Bureau of the Committee on Sustainable Energy in 2008 in order to facilitate worldwide application of the UNFC . In response to that request a simplified revised version of the Classification ( United Nations Framework Classification for Fossil Energy and Mineral Reserves and Resources 2009 ( UNFC-2009 ) ) was prepared by the UNFC Revision Task Force , which consisted of the Extended Bureau of the Ad Hoc Group of Experts , plus selected experts .