Watch the final episode of “The Power of Big Oil,” a three-part FRONTLINE docuseries investigating what scientists, corporations and politicians have known about human-caused climate change for decades — and the missed opportunities to mitigate the problem. This journalism is made possible by viewers like you. Support your local PBS station here: Throughout the first two episodes of “The Power of Big Oil,” FRONTLINE went inside the fossil fuel industry’s efforts in the 1980s, 1990s and 2000s to stall action on climate change by cultivating denial and doubt. The third and final episode of the series brings the story up to the present. “Delay,” part three of “The Power of Big Oil,” investigates how, even as the warnings about climate change grew, the U.S. reemerged as one of the world's biggest oil and gas producers, and the fossil fuel industry worked to delay the transition to renewable energy sources — including by promoting natural gas as a cleane
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