IS CLIMATE CHANGING ON EVEREST?

An expedition team has pulled off from its Everest trek citing unprecedented temperatures and unstable ice. The team also reported unusual sightings such as Sherpas working in T-shirts while setting up a base camp; only few days recorded temperature colder than -10C; lake formation at the base camp at the beginning of May among many others.
30 May
http://thinkprogress.org/climate/2012/05/30/491995/leading-climbing-outfit-cancels-2012-everest-trip-blaming-ice-dangers-due-to-warmth/