Around fifty countries carry out “seeding’, a molecular manipulation of clouds to make them rain in the event of drought or to avoid potentially devastating precipitation. “There is a real risk of cloud war,” according to Mathieu Simonet, ex-lawyer and author of The End of the Clouds.

The long-term health and environmental consequences of cloud seeding are not known. MathieuSimonet is one of those who demand that France ratify the 1976 ENMOD Convention, but also believe that the United Nations should propose international regulations.