Japan has started to release more than a million tonnes of treated waste water from the Fukushima nuclear power plant into the Pacific Ocean. The United Nations nuclear watchdog says it’s safe - but what actually is in the water? And why has there been so much criticism?

Hannah is joined by Navin Singh Khadka, a BBC World Service environment correspondent and Tessa Wong, a BBC reporter in Singapore to get the answers.

Our health correspondent James Gallagher also explains what exposure to radiation does to our bodies and health - and assesses how dangerous this waste water is.

Also in the episode - Coldplay, Beyoncé and Taylor Swift are famous for their huge international tours, but what environmental impact do concerts and festivals have? Jordan Dunbar tells us a bit about what he found out in his episode of The Climate Question podcast. Spoiler alert - it’s the fans, not the private jets.

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