Human impact on Khumbu Glacier melting

Research published in the journal ‘Regional Environmental Change’ indicates that human activity at Mount Everest Base Camp is accelerating the melting of the Khumbu Glacier. Studies suggest that localized warming is occurring faster than in surrounding areas due to the use of fossil fuels for cooking, heating, and electricity by approximately 1,600 tents during climbing seasons.

Scientists have also identified human waste as a contributing factor. A study focusing on the 50-day spring climbing season in 2023 found that the combination of heat from fuels and human urine released approximately 849,174 megajoules of energy. This thermal impact is estimated to melt roughly 2,500 tons of ice and snow annually.

Specifically, researchers noted that thousands of climbers, guides, and support staff produce approximately 6,000 liters of urine per day. While solid waste is often collected and transported down the mountain, much of this urine is discharged directly onto the glacier. Because the urine is released at body temperature (around 37°C) onto ice that remains below 0°C, it contributes to localized melting. Estimates suggest that urine alone could account for the melting of over 150 tons of ice per spring.

Satellite data from 1991 to 2023 shows rising surface temperatures at the Base Camp. Experts warn that this accelerated deglaciation threatens climber safety and poses risks to regional water sources, agriculture, and energy production, suggesting the potential relocation of the Base Camp to more stable terrain.