This is the story of how our modern scientific idea of nature, the self-regulating ecosystem, is actually a machine fantasy. It has little to do with the real complexity of nature. Adam Curtis explores how in an age of disenchantment with politics, the internet has given man the opportunity to create societies without leaders, as in the Facebook and Twitter revolutions. He draws a link with theories about nature, and looks back at how scientists in the 1950s came to regard the environment as a self-regulating ecosystem, but were eventually proved to have failed to grasp its essential dynamism.