Colombia is one of the most biodiverse countries in the world. But it’s also the most dangerous to be an environment activist. A report from Global Witness, a non-governmental organisation, says Colombia has the highest number of murders of green activists anywhere in the world.

The BBC’s Maria Clara Montoya has spoken to two young climate defenders - why are they at risk and what is being done to protect them?

(09:20) Also, scientists in the US are analysing dust collected from the Bennu asteroid - one of the most dangerous rocks in the solar system. Our Science Editor, Rebecca Morelle, takes us through what experts have learnt so far.

Email: [email protected]