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Emergency services had to postpone rescue operations over fears that further glaciers will collapse on the Italian mountain.

Mt. Everest is experiencing negative effects of climate change and plastics pollution, according to recent research. Credit: Papa Lima Whiskey 2 /CC BY-SA 2.0Climate change and plastics pollution, among other negative factors, are affecting the highest point on Earth, Mt. Everest, in increasingly worrying ways, according to recent research.New findings from the most recent, comprehensive scientific…

Good morning, everyone. welcome to "weekends with alex witt." here's what's happening right now. new this morning a desperate search is on for three missing guides after the deadliest accident ever on mt. everest. at least 13 sherpas were killed after an ice avalanche and now we're getting a clearer idea what happened as disaster struck. more from nbc's chief foreign correspondent, richard engel. >> reporter: there was a time when bodies were left on everest. >> helicopter is landing. >> need more medical help. >> reporter: dozens of climbers voen toured up to the avalanche zone at 19,000 feet...

You, is what it's going to take. it's dangerous work. >> indeed. it's important to be familiar with all of these pieces of technology. it could be some of what phil outlined. a million times thank you. when we come back, a fatal disaster claimed the lives of 12 incredibly experienced guides. any next guest has survived an avalanche and knew one of the brave sherpas who died. that's next. baron of the build-out. you need a permit... to be this awesome. an..rent from national. because only national lets you choose any car in the aisle... and go. and only national is ranked highest in car rental ...

Cut loose. >> what was it? 1999 you survived an avalanche? do you know when one is coming? how much time do you have? >> i was -- an avalanche came off of a high shoulder, an ice avalanche. you do have a moment where you realize that things are changing rapidly. you go from thought process to automatic reaction to save yourself. looking up at the horseshoe, it was always a matter of time when that was going to release and unfortunately it came down when there was a group of sherpas working in the ice ball.