Why scientists are tracking penguin poo in Antarctica

A group of scientists are currently on journey to the end of the world in hope of finding answers about our planet's future.

And our Science Correspondent Martin Stew is with them on board the RRS Sir David Attenborough. The only journalist on board in fact.

This week he's spoken to prime ministers, witnessed whales and even spotted penguins, whose existence is under severe threat. He tells Lucy Watson what you need to know.