The number of climate cases being brought to court has doubled over the last five years (Source: UNEP). There are now over 2,000 cases being brought against states, governments and companies. Over 30 of these have been brought by and on behalf of people under 25. Are these an effective way to force governments and companies to reduce their emissions? BBC climate reporter Georgina Rannard joins Hannah to answer our questions.

Six young people from Portugal are bringing 32 countries to trial at a hearing before the European Court of Human Rights. One of them, Andre, 15, tells us why.

And what’s it like to win? We hear from one of the people at the centre of the Montana case in the US, Rikki Held, which made headlines in August. Plus - the BBC’s Waihiga Mwaura in Nairobi gives us an update from the first Africa Climate Summit.

Email: whatintheworld@bbc.co.uk WhatsApp: +44 0330 12 33 22 6 Presenter: Hannah Gelbart with Georgina Rannard Producers: Mora Morrison and Julia Ross-Roy Editors: Verity Wilde and Simon Peeks