Even as the science grew more certain, the oil industry continued to block action to tackle climate change in the new millennium. In a revelatory interview, Christine Todd Whitman, George W Bush’s former environment chief, tells the story of how the industry successfully lobbied President Bush to reverse course on his campaign promise to regulate carbon emissions.

Tensions grew between two of the world’s biggest oil companies, ExxonMobil and BP, after the latter publicly called for action to tackle climate change. The election of Barack Obama provided hope for supporters of climate action, but the billionaire Koch brothers made an effort to block the new president’s attempts to pass climate change legislation, and climate denialism became the mainstream position of the Republican Party. A lawyer who worked for Kochs through this period speaks on camera for the first time. Show less