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A Nepalese Sherpa who climbed Mount Everest for a record 20th time said Tuesday that the melting of glacier ice along its slopes due to global warming is making it increasingly difficult to climb the peak."The rising temperature on the mountains has melted much ice and snow on the trail to the summit. It is difficult for climbers to use their crampons on the rocky surfaces," Apa told reporters after flying to Katmandu on Tuesday.

Apa said when he first began climbing Everest, there was hardly any rocky surface on the trail to the summit. Now, he says, the trail is dotted with bare rocks.