Episode details
Available for over a year
Dr Kate Dent from Berks, Bucks and Oxon Wildlife Trust says algae is to blame.
Programme WebsiteUse ÃÛÑ¿´«Ã½.com or the new ÃÛÑ¿´«Ã½ App to listen to ÃÛÑ¿´«Ã½ podcasts, Radio 4 and the World Service outside the UK.
Available for over a year
Dr Kate Dent from Berks, Bucks and Oxon Wildlife Trust says algae is to blame.
Programme Website