Blue Marine Foundation’s co-founder and former award-winning British film-maker George Duffield explains how overfishing is destroying the ocean’s biodiversity and its ability to store carbon yet is one of the world’s most solvable problems.

George hopes robust data gleaned from Blue’s partnership with scientists from Exeter University and Convex in the five-year Convex Seascape Survey will reveal how much carbon is stored in the seabed and he's confident the findings will provide a solution to help with runaway global temperatures.

Helen also hears some of George's favourite adventures as a diver and wildlife photographer - swimming with whale sharks and hammerheads in the Galapagos and diving under the ice with leopard seals in Antartica, which led to George winning the Natural History Museum's Underwater Photographer of the Year.