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Guardian Unlimited Observer | Focus | Warming world on thin ice Sherpas and Buddhist lamas told him the glacier no longer reached to where Hillary's base camp tents were pitched: it had melted three miles up the valley.
To check their accounts, McNaught-Davis climbed up to a glacial meltpool at 5,000 metres that 20 years ago was marked on maps as a series of small ponds.
He found that the ponds had merged into a vast lake more than a mile long. 'It was huge. I was completely amazed,' he said. 'Further up the glacier you can see more ponds forming.'
And it is happening so quickly that map makers cannot keep up.