In the late Middle Ages and the Renaissance, the figure of the fool held a firm place in society and was omnipresent in art, as he embodied the fears of Europeans in a convulsive time of great discoveries and religious controversies.

The Cold War's wildest dreams of climate control have made a spectacular comeback: from the USA to China, 'geo-engineers' promise to make climate change the way we want. And they have found powerful supporters among lobbyists and entrepreneurs. This film is an investigation into the world-wide boom in geo-engineering. How did a pseudo-science with a controversial past become a planet-wide research subject?