Coral around the world is turning white and even dying as recent record ocean heat takes a devastating toll. It has triggered the fourth “global mass coral bleaching event”. Hannah chats to What in the World producer Kevyah Cardoso about the magical life of coral.

BBC climate reporter Georgina Rannard explains what’s causing this bleaching and whether the coral can recover from it. And we hear from two parts of the world where people are trying to monitor and revive their coral reefs. The BBC’s Alfred Lasteck in Tanzania tells us about his visit to the Mnemba Island, Zanzibar where they are restoring the coral reefs. And 19 year old environmental activist and divemaster Emma Batty Sukerta, whose family are from Bali, Indonesia, talks about why she is recording the sounds of the coral reefs there.

Email: whatintheworld@bbc.co.uk WhatsApp: +44 0330 12 33 22 6 Presenter: Hannah Gelbart Producers: Kevyah Cardoso & Julia Ross-Roy Editor: Verity Wilde