Testimony in the US Congress, at the request of both parties.

2015: US House of Representatives Roundtable discussion on the True Costs of Fossil Fuels (see Economic Valuation page)

2014: US Senate, Dec 2 hearing on the “Super Pollutants Act of 2014” by the Environment and Public Works Committee.

Download the written testimony (pdf).

Below is a clip from the Q&A during the hearing.


2010: US House of Representatives, Mar 16 hearing on Black Carbon and Climate Change by the Select Committee on Energy Independence and Global Warming.

The entire Hearing is shown in Video below (testimony begins around minute 20)

Download the written testimony (pdf).



2007: US House of Representatives, Jan 30 hearing on Scientific Integrity by the Congressional Oversight and Government Reform Committee.
Dowload the written testimony (pdf).


2004: US Senate, Nov 16 hearing on Arctic and Antarctic Climate Change by the Commerce, Science and Transportation Committee.

    The Hearing Video is posted on C-SPAN (search for Nov. 16, 2004, hearing is called “Global Climate Change Assessment”)