The ocean covers over 70% of the Earth’s surface and can hold more than 150 times the amount of carbon dioxide as air. Around a quarter of CO2 emissions created by human activity each year is absorbed by them. From phytoplankton to whales to seagrass meadows we explore how this happens. Jordan Dunbar and Kate Lamble are joined by: Rita Steyn, Contributing Editor at The Marine Diaries and lecturer at University of Tampa, Florida Michael Yap, Marine Biologist and Founder of Seagrass Guardians, Malaysia Dr. Haimanti Biswas, Principal Scientist of Biological Oceanography at CSIR-National Institute of Oceanography, India Dr. Annette Scheffer, Marine Biologist and Lecturer, speaking with us from Antarctica John Kirkwood, Marine Biologist and Expedition Leader speaking with us from Antarctica Researcher: Immie Rhodes Reporter: Mark Stratton Producer: Dearbhail Starr Series Producer: Alex Lewis Editor: Richard Fenton-Smith Sound Engineer: Tom Brignell