What if countries could sue each other for wrecking the climate? Well, that’s now a real possibility after a decision by the UN’s top court, the International Court of Justice (the ICJ). The court made the decision after a group of young law students from low-lying Pacific islands on the frontlines of climate change started a campaign in 2019. But critics say it will be hard to untangle who caused what when it comes to climate change — and that they’re already making good progress when it comes to reducing harm to the environment.

BBC Climate and Science Correspondent Georgina Rannard talks us through what this decision means and how it could impact future climate cases. And we hear from two of the young campaigners who helped bring this case to the ICJ, who tell us what this decision means to them and their communities.

Instagram: @bbcwhatintheworld Email: whatintheworld@bbc.co.uk WhatsApp: +44 330 12 33 22 6 Presenter: Hannah Gelbart Producers: Emily Horler and Chelsea Coates Editor: Verity Wilde

Period tracking apps help you track your menstrual cycle, so you know when to expect your period. They’re growing in popularity worldwide, with the three most popular ones racking up over 250 million downloads between them. But studies show that some women might also be using them to avoid getting pregnant.

One of the apps, Natural Cycles, has been approved in the US to be used as a contraceptive. The company claims it is 93% effective at preventing pregnancies, when used perfectly. So why are more people turning to these apps? Are they safe to use as a contraceptive and what are the risks?

Sexologist Rayka Kumru from Turkey explains why these period tracking apps are becoming so popular and the privacy concerns around using them. Dr Francesco Rampazzo, a lecturer in Demography at the University of Oxford, tells us more about where period tracking apps are getting the most downloads.

Instagram: @bbcwhatintheworld Email: whatintheworld@bbc.co.uk WhatsApp: +44 330 12 33 22 6 Presenter: Hannah Gelbart Producers: Chelsea Coates, Benita Barden and Emilia Jansson Video Journalist: Baldeep Chahal Editor: Harriet Oliver

Violence has flared up again in Syria, this time in the southern province of Suweida. Fighting has broken out between the government forces and two minority groups: the Druze and the Bedouins. It’s not the first time that the stability of the country has been shaken since the fall of dictator Bashar al-Assad last December. But it signals the challenges the new government faces - not just from internal violence, but from its neighbours. Israel launched air strikes on Suweida and the Syrian capital, Damascus, and says it will only hold a US-backed ceasefire if the Druze are protected. So, what’s behind this conflict - and what does it mean for the future of Syria?

We speak to BBC Monitoring journalist Tess Mallinder Heron, to explain who the different groups involved in the fighting are and what’s behind the dispute. And we hear from our BBC Middle East Correspondent in Damascus, Lina Sinjab, who tells us what life has been like for people in Syria since the fall of Assad’s regime - and how the new government is trying to maintain control in Syria.

Instagram: @bbcwhatintheworld Email: whatintheworld@bbc.co.uk WhatsApp: +44 330 12 33 22 6 Presenter: Hannah Gelbart Producers: Emily Horler and Chelsea Coates Editor: Verity Wilde