Reuters: A Nepali sherpa who holds the world record for climbing Mount Everest said on Monday rising temperatures were melting snow and turning the slopes barren, making it even harder to scale the world’s tallest peak. Apa Sherpa, back from his 19th successful ascent of Everest last week, said a snow trail along the route to the peak was now just a stretch of bare rocks, as climate change pushed up snowlines and shrank glaciers. “This makes climbing the mountain difficult because …