By the late 1980s, oil companies had internal scientists telling them climate change was real and driven by fossil fuels. This FRONTLINE installment tracks what happened next: a coordinated campaign to manufacture public doubt about that same science. Executives, lobbyists, and former industry insiders describe how companies funded think tanks, seeded skeptical research, and used PR firms to keep the question of climate change looking unsettled long after their own scientists had settled it internally. The film follows the political fights this doubt enabled, from congressional hearings to international climate negotiations, showing how delay tactics shaped decades of energy policy. Archival news footage, corporate memos, and testimony from scientists who tried to raise alarms sit alongside interviews with journalists who spent years tracing the money behind the skepticism. The second chapter in a three-part series, it builds directly on the industry's early climate research covered in part one, and it treats obstruction not as a side effect of business but as a deliberate strategy.