Climate scientist Michael Mann https://twitter.com/MichaelEMann gave testimony at hearing, titled “Climate Science: Assumptions, Policy Implications, and the Scientific Method,” was organized to “examine the scientific method and process as it relates to climate change” and “focus on the underlying science that helps inform policy decisions.”

Mann talk starts at 29:30 minutes in.

House Science Committee Hearing Pits Three Fringe Climate Deniers Against Mainstream Climate Scientist Michael Mann https://www.desmogblog.com/2017/03/29/house-science-committee-hearing-lamar-smith-michael-mann-climate-consensus-deniers

“Science”: Committee Show Hearing on Climate Change https://climatecrocks.com/2017/03/29/science-committee-show-hearing-on-climate-change/

A Scientist Just Spent 2 Hours Debating the Biggest Global Warming Deniers in Congress https://www.motherjones.com/environment/2017/03/michael-mann-lamar-smith-house-science-committee/