The Doubt Machine: Inside the Koch Brothers' War on Climate Science

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The Doubt Machine: Inside the Koch Brothers' War on Climate Science is a 2016 documentary short about Koch Industries and its efforts to discredit climate research.{{cite news |title=The Doubt Machine: Inside The Koch Brothers' War on Climate Science |url=https://www.greanvillepost.com/2016/11/02/the-doubt-machine-inside-the-koch-brothers-war-on-climate-science/ |accessdate=3 May 2019 |work=Greenville Post}} Released by The Real News Network on October 31, it was narrated by actress Emma Thompson.{{cite web |url=http://therealnews.com/t2/index.php?option=com_content&task=view&id=2930 |title=The Doubt Machine: Inside the Koch Brothers' War on Climate Science |publisher=The Real News Network |accessdate=2 November 2016}}