Spring is go time for climbers who hope to summit Mount Everest, Earth’s highest peak above sea level. Hundreds of mountaineers from around the world travel to Asia in April and May, headed for base camps in Nepal and Tibet.

But jagged peaks won’t be the only thing they see. Especially on Everest’s more heavily traversed Nepal side, they’ll find fields of garbage – including cans, bottles, plastic and human and animal excrement.

Each year, more than 60,000 trekkers and climbers visit the Sagarmatha National Park and Buffer Zone, a high-altitude swath of the Khumbu region in northeast Nepal that includes Everest and seven other peaks. Some 400 to 500 climbers attempt to summit Everest every year.

The trash problem first became evident in the 1980s and 1990s, when climbing on the mountain and trekking in Khumbu began to increase. Climber and trekker numbers have further skyrocketed in the past 20 years.

Most coverage of this issue focuses on negative and sensational aspects, such as the frozen bodies of climbers who remain where they died on the mountain because removal operations are risky and expensive.

We are scholars who study geoscience and mountain geography, and one of us (Alton Byers) has lived in Nepal and worked with communities around Everest. We are encouraged to see increased efforts to address Everest’s massive trash problem. In our view, modern technology and international cooperation are key to ending the pileup of waste in this iconic setting.

For most visitors to this area of the Himalayas, Everest base camp on the upper reaches of the rapidly receding Khumbu Glacier is the ultimate destination, at an altitude of 17,589 feet (5,364 meters). Formerly a two- to three-week trek from Kathmandu, today the journey is most likely to begin at the Lukla Airport, which sits about 35 miles (60 kilometers) from base camp.

Climbers who aim to summit Everest typically spend up to two months on the mountain, including weeks making short, incremental ascents above base camp and back down again. This enables them to acclimate to the altitude before climbing to higher camps and then to the summit.

Much of the food and equipment headed to Everest also begins its journey at Lukla. Some is shipped to base camp by helicopter, but much of the gear is carried there by yaks, yak/cattle crossbreeds called dzopkio, mules and horses.

Lots of equipment, food and packaging, plus animals and porters, means a lot of garbage. A 2010 study estimated that park tourism generated 4.6 tons of solid waste per day during peak tourist periods in April-May and October-November.

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