Everest risks contamination by a growing mountain of human waste

The climbers who each year attempt to follow in Tenzing and Hillary’s footsteps to  the summit of Mount Everest are threatening to bring environmental disaster to the  roof of the world – by their toilet habits.

The head of Nepal’s mountaineering association has warned that human waste left when climbers use holes in the snow as lavatories is contaminating the world’s highest peak. Some 700 climbers spend almost two months every year on Everest’s slopes during the season when conditions allow climbers to reach the peak – from this week until May – and are leaving large amounts of faeces and urine buried in the snow.