How China changed the weather to clear skies for Beijing centenary celebration

A new report by Tsinghua University in Beijing has revealed that the Chinese Communist Party used cloud seeding to artificially bring down pollution levels for its centenary celebrations on July 1. The peer-reviewed study shows just how far China has come with this technology. FRANCE 24's Technology Editor Peter O'Brien breaks down how cloud seeding works, and the scale of China's ambitions to change the weather.