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What if countries could sue each other for wrecking the climate?
After a decision by the UN's top court, that's now a real possibility.
But critics say it'll be hard to untangle who caused what when it comes to climate change.
I'm Hannah Gelbart.
I'm the host of What in the World, an award-winning daily podcast from the BBC World Service.
Come have a listen wherever you get your BBC podcasts.
Hello and welcome to News Hour from the BBC World Service.
I'm Celia Hatton and I'm coming to you live from our studio in London.
Coming up on the programme today,
Thailand and Cambodia have been arguing over their border for years.
We'll explore why fresh fighting has broken out now.
And how many steps do you really need to walk every day to stay healthy?
You might be surprised by the answer.
But first, we'll start this edition of News Hour in Haiti.
We've gained rare access to the Haitian capital,
Port-au-Prince, where gangs now control 90% of the city.
The police there are outnumbered and outgunned.
Government authority has all but collapsed and ordinary Haitians are trapped in a daily struggle for survival.
In the last six months, more than 4,000 people have been killed.