Guardian Seascapes reporter Karen McVeigh tells Madeleine Finlay about a recent trip to the Galápagos Islands, where mounds of plastic waste are washing up and causing problems for endemic species. Tackling this kind of waste and the overproduction of plastic were the topics on the table in Ottawa this week, as countries met to negotiate a global plastics treaty. But is progress too slow to address this pervasive problem?

On Monday, Scotland’s first minister Humza Yousaf announced his resignation. What does this mean for the Scottish National party? Severin Carrell and Libby Brooks report

This week, Jonathan Freedland is joined by Jeff Nussbaum, a former senior speech writer to Joe Biden, to discuss the art of writing gags for presidents and whether there is still space humour in US politics

Police have arrested dozens of students across US universities this week after a crackdown on pro-Palestine protests on campuses. Erum Salam and Margaret Sullivan report from New York