Greenhouse gas trading program hearing before the Committee on Energy and Natural Resources, United States Senate, One Hundred Eleventh Congress, first session, to explore potential costs and price volatility in the energy sector as a result of a greenhouse gas trading program and ways to reduce or contain those costs, September 15, 2009

Creating jobs with climate solutions how agriculture and forestry can help lower costs in a low-carbon economy : hearing before the Subcommittee on Rural Revitalization, Conservation, Forestry, and Credit of the Committee on Agriculture, Nutrition, and Forestry, United States Senate, One Hundred Tenth Congress, second session, May 21, 2008

Addressing price volatility in climate change legislation hearing before the Committee on Ways and Means, U.S. House of Representatives, One Hundred Eleventh Congress, first session, March 26, 2009

Market-based greenhouse gas control: selected proposals in the 111th Congress

Hearing on scientific objectives for climate change legislation

Evaluating limits on participation and transactions in markets for emissions allowances

The economic effects of legislation to reduce greenhouse-gas emissions

Effects of a carbon tax on the economy and the environment

Reducing emissions while driving economic growth : industry-led initiatives : hearing before the Subcommittee on Clean Air and Nuclear Safety of the Committee on Environment and Public Works, United States Senate, One Hundred Sixteenth Congress, first session, October 17, 2019

The state of climate science and why it matters : hearing before the Committee on Science, Space, and Technology, House of Representatives, One Hundred Sixteenth Congress, first session, February 13, 2019