Some 8 million tons of plastic end up in the oceans every year, where it can be lethal to marine life. Governments and businesses have vowed to take action to curb it. But Just how serious is the problem of plastic waste, and what can be done to tackle it?

David Aaronovitch is joined by:

Susan Freinkel, author of 'Plastic: A Toxic Love Story'

Jan Piotrowski, environment correspondent for the Economist

Rob Opsomer, researcher, Ellen Macarthur Foundation

Chris Cheeseman, Professor of Materials Resource Engineering, Imperial College, London

Sabine Pahl, Associate Professor of Psychology, University of Plymouth.