Cool cows: The cattle challenging climate change

Whether they are providing the beef for your roast dinner or the milk for your cup of tea – cows are undeniably useful animals. The problem is they also enjoy burping and breaking wind and it's having a huge impact on global warming. The steaks couldn’t be higher and that’s why an agricultural college in Scotland has developed the Cool Cows programme to breed the animals in a way that means they expel less gas. Niall is joined by our udderly brilliant science correspondent, Thomas Moore. Producers: Natalie Ktena & Tom Gillespie Editor: Mike Bovill