'We need more athletes to speak out': the future of sport in a warming world

Spanning venues in the United States, Canada and Mexico, and welcoming teams from a record 48 countries, this year's World Cup will carry a massive carbon footprint – and see players exposed to potentially dangerous heat. Sports and sustainability expert Mael Besson tells RFI why organisers need to pay more attention to climate change, how it is already affecting professional and amateur athletes alike, and why we should expect bigger shifts to come.