Sir David Attenborough believes there is "very convincing" evidence that Yetis exist.

Speaking on Friday Night With Jonathan Ross, the revered wildlife expert said: "I'm baffled by the Abominable Snowman - very convincing footprints have been found at 19,000ft. No-one does that for a joke. I think it's unanswered."

Sir David also spoke about not being able to halt climate change.

He said: "We can never go back, there's no doubt about that... it's the speed at which we're changing.

"Before, it was thousands of years and now it's decades... but we can slow down the rate at which we change."

Meanwhile, U2 frontman Bono revealed the meaning behind the band's new song Get On Your Boots - saying it was East African slang for "use a condom".

Bono said: "In all sincerity, I haven't even told the band that before."