NEW YORK (AFP) – When British climbing legend George Mallory took his iconic 1921 photo of Mount Everest's north face, the mighty, river-shaped glacier snaking under his feet seemed eternal. Decades of pollution and global warming later, modern mountaineer David Breashears has reshot the picture at the same spot -- and proved an alarming reality. Instead of the powerful, white, S-shaped sweep of ice witnessed by Mallory before he died on his conquest of Everest, the Main Rongbuk Glacier today is shrunken and withered. The frozen waves of ice pinnacles -- many .. the size of office buildings -- are...