Marcus Ericksen is the co-founder and director of research for the 5 Gyres Institute. He has been on more than 20 ocean-crossing expeditions, written and published research on the impact of plastic pollution in the world's oceans, and authored Junk Raft about a trip from Los Angeles to Hawaii and My River Home: A Journey from the Gulf War to the Gulf of Mexico. In this episode Marcus discusses plastic in the ocean including the problems it causes, where it comes from, how much is in the water, and what can be done.