In the United States, students themselves are now advocating for gun control. One of the most compelling young activists is Emma Gonzales, a senior at the Florida school where 17 students and staff were killed on Valentine's Day. She's become the voice of what's been dubbed the Mass Shooting Generation, taking on both President Donald Trump and the powerful NRA. Nick Rushworth takes a closer look. Meanwhile, it's been less than a week since Brazilian activist and councilwoman Marielle Franco was murdered. Protesters have been gathering nationwide to show their anger over her assassination.

Also this week in Brazil, the World Water Forum is taking place in the capital Brasilia. Brazil is a country that seems rich when it comes to water, but in fact, those resources are unevenly distributed. Over one in four Brazilians have no access to purified drinking water and dirty water from sanitation regularly pours into nature. Our correspondents Fanny Lothaire and Catherine Osborn have more.

And Evo Morales, the president of Bolivia, is fighting to solve a 139-year-old dispute with Bolivia's neighbour Chile. At stake is the possibility of changing the country’s borders to give land-locked Bolivia access to the Pacific Ocean. This week, he's been in front of the UN's highest judicial body, the World Court.