Charles Goddard, editorial director at The Economist Group speaks to two experts about the scope and scale of the problem of chemical pollution in the ocean, and asks how worried we should be about the impact of chemical pollution on ocean life and ecosystems, and human health. The guest speakers are: - Elsie Sunderland, the Gordon McKay professor of environmental chemistry, and professor of earth and planetary sciences at Harvard University - Alex Rogers, director of science at REV Ocean, a privately funded research and expedition vessel, and visiting professor at Oxford UniversityRelevant content: - World Ocean Summit Asia-Pacific on-demand - Other Back to Blue podcastsThis is the first of a series of podcasts on chemical pollution under the Back to Blue initiative of Economist Impact and The Nippon Foundation.