Everest Basecamp to be Moved

Navin Singh Khadka Environment correspondent for BBC World Service:

Nepal is preparing to move its Everest base camp because global warming and human activity are making it unsafe.

Everything is changing.

The camp currently sits at an altitude of 5,364m. The new one will be 200m to 400m lower.

How much longer until some of our most iconic mountain climbing routes will be impossible to climb?