Response of debris-covered glaciers in the Mount Everest region to recent warming, and implications for outburst flood hazards - Benn,DI; Bolch,T; Hands,K; Gulley,J; Luckman,A; Nicholson,LI; Quincey,D; Thompson,S; Toumi,R; Wiseman,S (EARTH-SCIENCE REVIEWS, 2012)