In the 1970s, fossil fuel giant Exxon funded a scientific team within the corporation to study the effects of emissions on the global climate. Once the team reported a summary of its findings, which were independently corroborated by a separate team at MIT, Exxon disbanded the scientific unit, and the summary disappeared into locked corporate files. In the five decades since then, the fossil fuel industry and its major suppliers have launched an elaborate defense against scientific research that has continued to captivate and roil the political will of America. Witness this amazing story of corporate and political twists and turns on the 3-part PBS Frontline documentary available for streaming online. Part 3 airs May 3 at 9 pm Central online and at 10 pm on Channel 11.