Opening of the session 9 . The session opened with a welcome address by the Deputy Executive Secretary of ECE , who drew attention to the voluntary nature of the work on development of the United Nations Framework Classification for Fossil Energy and Mineral Reserves and Resources 2009 ( UNFC-2009 ) , noting that the progress made to date was a result of significant in-kind contributions ( time , travel , and sponsorship ) provided by experts from around the world and that these contributions are greatly appreciated .