A holy book is pictured as a monk recites it while performing religious rituals in memory of Aan Kaji Sherpa, one of the 16 Nepali Sherpa guides who were killed during an avalanche last year, at a monastery in Kathmandu April 18, 2015. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April 2014, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. REUTERS/Navesh Chitrakar 

A man lights butter lamp in front of the portraits of 16 Nepali Sherpa guides, who were killed during an avalanche last year, during an event organised in memory of the Sherpas in Kathmandu April 18, 2015. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April 2014, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. REUTERS/Navesh Chitrakar 

A man offers flower in front of the portraits of 16 Nepali Sherpa guides, who were killed during an avalanche last year, during an event organised in memory of the Sherpas in Kathmandu April 18, 2015. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April 2014, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. REUTERS/Navesh Chitrakar 

Daughter of Aas Bahadur Gurung, whose body is still missing and is one of the 16 Nepali Sherpa guides who were killed during an avalanche last year, rubs her eyes during an event organised in memory of the deceased sherpas in Kathmandu April 18, 2015. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April 2014, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. REUTERS/Navesh Chitrakar 

A monk blows a conch while performing religious rituals in memory of Aan Kaji Sherpa, one of the 16 Nepali Sherpa guides who were killed during an avalanche last year, at a monastery in Kathmandu April 18, 2015. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April 2014, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. REUTERS/Navesh Chitrakar 

Monks performs religious rituals in memory of Aan Kaji Sherpa, one of the 16 Nepali Sherpa guides who were killed during an avalanche last year, at a monastery in Kathmandu April 18, 2015. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April 2014, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. REUTERS/Navesh Chitrakar 

A monk recites a holy book while performing religious rituals in memory of Aan Kaji Sherpa, one of the 16 Nepali Sherpa guides who were killed during an avalanche last year, at a monastery in Kathmandu April 18, 2015. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April 2014, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. REUTERS/Navesh Chitrakar 

Daughters of Aan Kaji Sherpa, one of the 16 Nepali Sherpa guides who were killed during an avalanche last year, light butter lamps in memory of their father at a monastery in Kathmandu April 18, 2015. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April 2014, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. REUTERS/Navesh Chitrakar 

Family members of Aan Kaji Sherpa, one of the 16 Nepali Sherpa guides who were killed during an avalanche last year, take part in a ritual in memory of their diseased family member at a monastery in Kathmandu April 18, 2015. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April 2014, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. REUTERS/Navesh Chitrakar 

A family member of Aan Kaji Sherpa, one of the 16 Nepali Sherpa guides who were killed during an avalanche last year, offers prayer in memory of Aan Kaji at a monastery in Kathmandu April 18, 2015. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April 2014, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. REUTERS/Navesh Chitrakar 

Daughters of Aan Kaji Sherpa, one of the 16 Nepali Sherpa guides who were killed during an avalanche last year, light butter lamps in memory of their father at a monastery in Kathmandu April 18, 2015. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April 2014, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. REUTERS/Navesh Chitrakar TPX IMAGES OF THE DAY

New Zealand All Blacks captain Richie McCaw holds the Sir Edmund Hillary Shield after beating England in the second rugby union test match at Forsyth Barr Stadium in Dunedin June 14, 2014. REUTERS/Anthony Phelps (NEW ZEALAND - Tags: SPORT RUGBY) 

New Zealand All Blacks pose with the Sir Edmund Hillary Shield and Steinlager Cup after beating England in the second rugby union test match at Forsyth Barr Stadium in Dunedin June 14, 2014. REUTERS/Anthony Phelps (NEW ZEALAND - Tags: SPORT RUGBY) 

New Zealand All Blacks pose with the Sir Edmund Hillary Shield and Steinlager Cup after beating England in the second rugby union test match at Forsyth Barr Stadium in Dunedin June 14, 2014. REUTERS/Anthony Phelps (NEW ZEALAND - Tags: SPORT RUGBY) 

Light from a sunrise illuminates Mount Pumori, which is approximately 7,100 meters high, as trekkers look at the mountains from Kala Patthar in Solukhumbu District May 7, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken May 7, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL)

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A trekker stands in front of Mount Everest, which is 8,850 meters high (C), at Kala Patthar in Solukhumbu District May 7, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken May 7, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL TPX IMAGES OF THE DAY)

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Trekkers stand in Everest Base camp, approximately 5,300 meters above sea level, in Solukhumbu District May 6, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken May 6, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL TPX IMAGES OF THE DAY)

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Phurba Tenzing Sherpa, 24, who has reached the summit of Everest nine times, sits inside his tent at Everest Base camp, approximately 5,300 meters above sea level in Solukhumbu District May 6, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken May 6, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL)

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Garbage collectors collect rubbish at the deserted Everest base camp, approximately 5,300 meters above sea level, in Solukhumbu District May 6, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken May 6, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL)

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A porter carries mattresses back from Everest base camp, approximately 5,300 meters above sea level, in Solukhumbu District May 6, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken May 6, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL TPX IMAGES OF THE DAY)

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Trekkers walk in front of Mount Thamserku while on their way back from Everest base camp at Pheriche, approximately 4,300 meters above sea level, in Solukhumbu District May 3, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken May 3, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL)

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Prayer flags flutter over the Lobuche River on the way to Everest base camp near Pheriche, approximately 4,300 meters above sea level, in Solukhumbu District May 3, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken May 3, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT RELIGION TRAVEL)

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A trekker walks in front of Mount Thamserku while on his way back from Everest base camp near Pheriche in Solukhumbu District May 3, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken May 3, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL)

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Yaks walk past prayer flags as they carry goods back from Everest base camp in Solukhumbu District May 5, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken May 5, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT ANIMALS RELIGION TRAVEL)

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Everest base camp is seen approximately 5,300 meters above sea level in Solukhumbu District May 6, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken May 6, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL)

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Yaks head towards the Everest base camp in Solukhumbu District April 28, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken April 28, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT ANIMALS TRAVEL)

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A Nepalese army personnel sits inside a check post as he waits to check permits for trekkers passing by, in Solukhumbu District April 26, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken April 26, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT MILITARY TRAVEL)

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A yak herder leads yaks near Pheriche, approximately 4,300 meters above sea level, in Solukhumbu District May 3, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken May 3, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT ANIMALS TRAVEL)

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Trekking guide Birbal Thapa Magar makes an emergency phone call to check on his clients' health, in Pheriche, approximately 4,300 meters above sea level, in Solukhumbu District May 3, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken May 3, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL)

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Shoes are left out to dry after being washed, in Solukhumbu District April 26, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken April 26, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL)

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Trekkers have their oxygen level checked at the Himalayan Rescue Association Nepal post in Pheriche, approximately 4,300 meters above sea level, in Solukhumbu District May 3, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken May 3, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL)

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A yak walks past a clothing store in Namche, approximately 3400 meters above sea level in Solukhumbu District April 27, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken April 27, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ANIMALS ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL)

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Mount Everest, which is 8,850 meters high, is seen through the window of a monastery in Tengboche, Solukhumbu District May 2, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken May 2, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL)

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Water is boiled using solar power in Khumjung, approximately 3700 meters above sea level in Solukhumbu District April 30, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken April 30, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL)

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A porter rests inside a porterhouse in Tengboche, approximately 3,800 meters above sea level, in Solukhumbu District May 1, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken May 1, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL)

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Nang Tashi Sherpa, 64, a witch doctor, sits inside his house in Khumjung, Solukhumbu District April 30, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken April 30, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL TPX IMAGES OF THE DAY)


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A woman works on a field in front of Mount Thamserku in Khumjung, approximately 3700 meters above sea level in Solukhumbu District April 30, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken April 30, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL)

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Nima Doma Sherpa, 25, whose husband Lakpa Sherpa, 26, died in the avalanche on April 18 2014, holds her daughter Pasang Choti Sherpa as she poses for a photograph with her father-in-law Tenzing Sherpa, 56, (C) and mother-in-law Chamchi Phuti Sherpa, 55, (R) inside their house in Khumjung approximately 3700 meters above sea level in Solukhumbu District May 8, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken May 8, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL)

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50-day-old Pasang Choti Sherpa whose father, Lakpa Sherpa, died in the avalanche on April 18 2014, lies on her mother's lap in Khumjung approximately 3700 meters above sea level in Solukhumbu District May 8, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken May 8, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL TPX IMAGES OF THE DAY)

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A novice monk walks past the Kyamgon Tashi Chocling Monastery at Lukla, approximately 2800 meters above sea level in Solukhumbu district April 25, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken April 25, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT RELIGION TRAVEL TPX IMAGES OF THE DAY)

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Dr. Sagar Panthin sits inside the Kunde Hospital, founded in 1966 by Sir Edmund Hillary, one of the first climbers to reach the summit of Mount Everest, in Khumjung, Solukhumbu District April 30, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken April 30, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL)

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A statue of Sir Edmund Hillary, one of the first climbers to reach the summit of Mount Everest and the founder of Khumjung High School, is seen in the school grounds in Khumjung, approximately 3700 meters above sea level in Solukhumbu District May 8, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken May 8, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL)

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A boy plays near a white board inside a classroom at Khumjung High School, which was founded in 1961 by Sir Edmund Hillary, the first climber to reach the summit of Mount Everest, in Khumjung, approximately 3700 meters above sea level in Solukhumbu District April 30, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken April 30, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL)

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Temba Sherpa, 45, who has reached the summit of Everest seven times, climbs to clean the mani (prayer) stone in Khumjung, approximately 3700 meters above sea level in Solukhumbu District May 8, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken May 8, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL)

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Porter Lakpa Sherpa, 42, is silhouetted as he stands in front of Mount Kongde, approximately 3400 meters above sea level in Solukhumbu District April 27, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken April 27, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL TPX IMAGES OF THE DAY)

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Porter Lakpa Sherpa, 42, walks along the tracks while on his way to Everest base camp in Solukhumbu District April 26, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken April 26, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL)

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Mount Ama Dablam, which stands approximately 6800 meters above sea level, is seen behind Khumjung Village in Solukhumbu District April 30, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken April 30, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL)

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A porter crosses a bridge while on his way back from Namche, approximately 3400 meters above sea level in Solukhumbu District April 26, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken April 26, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL)

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Kedar Rai (R), 42, and his sons carry goods to their shop in Solukhumbu District April 26, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken April 26, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL)

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Porter and climber Tenzing Bhotay Sherpa, 31, looks through the window of a lodge after arriving from Everest base camp, in Phunki Tenga in Solukhumbu District April 30, 2014. According to Tenzing he crossed the Khumbu Icefall just five minutes before the April 18 avalanche struck. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken April 30, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL)

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Khunjung Sherpa, 90, who earned 0.09 USD a day when he worked as a porter, sits outside his house in Namche, Solukhumbu District April 27, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken April 27, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL)

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A boy drinks drops of water dripping from a public tap in Solukhumbu District April 30, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken April 30, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL)

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Yak bells are seen outside a shop in Namche, approximately 3400 meters above sea level in Solukhumbu District April 27, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken April 27, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL)

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A construction worker shows his torn gloves as he carves stones while building a hotel in Namche, approximately 3400 meters above sea level in Solukhumbu District April 27, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken April 27, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL)

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A construction worker is seen through a split tree trunk while building a hotel in Namche, approximately 3400 meters above sea level in Solukhumbu District April 27, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken April 27, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL)

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A woman sits in the window of her shop on the way to Namche in Solukhumbu District April 26, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken April 26, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL)

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American climber Alex Goldfarb, who had to cancel his planned climb of Mount Lhotse, reads a book in Solukhumbu District May 5, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken May 5, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL)

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Lights illuminate a street in the evening in Namche, approximately 3440 meters above sea level in Solukhumbu District April 27, 2014. More than 4,000 climbers have reached the summit of Everest, the world's highest peak, since it was first scaled by Sir Edmund Hillary and Tenzing Norgay Sherpa in 1953. In April, an avalanche killed 16 Nepali Sherpa guides who were fixing ropes and ferrying supplies for their foreign clients to climb the 8,850-metre (29,035-foot) peak. The accident - the deadliest in the history of Mount Everest - triggered a dispute between sherpa guides who wanted a climbing ban in honour of their colleagues and the Nepali government that refused to close the mountain. The sherpas staged a boycott, forcing hundreds of foreign climbers to call off their bids to climb Everest. Picture taken April 27, 2014. REUTERS/Navesh Chitrakar (NEPAL - Tags: ENVIRONMENT SOCIETY BUSINESS EMPLOYMENT TRAVEL)

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