Captain Birdseye and his pals have finally come to the climate party. An unprecedented agreement - signed just down the road from Babble HQ - will see global shipping cut CO2 in half. About time too.

We dig around below deck to see what's really going on, and try to understand why there are 29,000 rubber ducks floating round the world's oceans.

Also this week, another glorious victory for the Babble campaigning machine.

Sustainababble is your friendly environment podcast, out weekly. Theme music by the legendary Dicky Moore – @dickymoo. Sustainababble logo by the splendid Arthur Stovell.

Available on iTunes, Acast, Soundcloud & all those types of things, or at sustainababble.fish. Visit us at @thebabblewagon and at Facebook.com/sustainababble. Email us at hello@sustainababble.fish.