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Mount Everest is the world's 
 mountain. An 
 in the number of 
 has led to poo being left on the 
. A local official said: "Our mountains have begun to stink." He added: "Human poo is 
 on rocks, and some climbers are falling 
. This is not 
. It damages our image." Climbers must now buy a bio-degradable "poop 
" for their poo. They then throw the bag away when 
 come down from the 
.