Liz Bonnin and Ade Adepitan investigate two ambitious river restoration projects. Liz returns to northern California, where the largest dam removal project in US history is aiming to resuscitate the river Klamath, while Ade investigates the colossal detox of Paris' iconic river Seine, which was prompted by the need for swimmers to use it during the 2024 Olympic and Paralympic Games, but which has benefits for the river's wildlife.
