In this episode, brought to you from the Singapore Management Festival, Graham Brown sits down with Lewis Pugh, ocean advocate and endurance swimmer - who's often referred as the "Sir Edmund Hilary of swimming" and UN Patron of Oceans. Lewis shares his experiences undertaking a variety of endurance challenges around the world, including swimming in every ocean, across the English Channel, and even how he swam Mount Everest! The pair also discusses different environmental issues facing the planet such as plastic pollution and climate change, particularly rising temperatures in the Arctic. Lewis delves into the challenges he's faced in raising awareness for environmental concerns, how he deals with the frustration of slow progress, and how world leaders need to take more courageous action.