Apa Sherpa, who broke his own record and climbed Mount Everest for the 20th time, waves to the media after arriving from the Everest region in Kathmandu, Tuesday. The 49-year-old first climbed Everest in 1989 and has repeated the feat almost every year since. His closest rival is fellow Sherpa guide Chhewang Nima, who has made 16 trips to the summit. He said that the melting of glacier ice along its slopes due to global warming is making it increasingly difficult to climb the peak.
