Future energy needs hearing before the Committee on Energy and Natural Resources, United States Senate, One Hundred Tenth Congress, second session, to receive testimony on the challenges to meeting future energy needs and to developing the technologies for meeting increased global energy demand in the context of the need to address global climate change, June 25, 2008

Terrestrial carbon sequestration in National Parks : values for the conterminous United States

Climate change : it's happening now : hearing before the Committee on Environment and Public Works, United States Senate, One Hundred Fourteenth Congress, first session, July 18, 2013

Update on the latest climate change science and local adaptation measures hearing before the Committee on Environment and Public Works, United States Senate, One Hundred Twelfth Congress, second session, August 1, 2012

Climate change : the impacts and the need to act : oversight hearing before the Committee on Natural Resources, U.S. House of Representatives, One Hundred Sixteenth Congress, first session, Wednesday, February 6, 2019

Examining EPA's regulatory overreach : hearing before the Committee on Science, Space, and Technology, House of Representatives, One Hundred Fourteenth Congress, first session, July 9, 2015

EPA regulatory overreach : impacts on American competitiveness : hearing before the Committee on Science, Space, and Technology, House of Representatives, One Hundred Fourteenth Congress, first session, June 4, 2015

The Federal Ocean Acidification Research and Monitoring Act H.R. 4174 : hearing before the Subcommittee on Energy and Environment, Committee on Science and Technology, House of Representatives, One Hundred Tenth Congress, second session, June 5, 2008