Climate action tested on a divided Mt Everest

Warming in this Third Pole is happening at double the global rate and has been pronounced over the past 60 years. With the arrival of this human infrastructure here, our understanding of climate change on Mt Everest has reached an inflection point

Anew landmark greeted mountaineers nearing the summit of Mount Everest this spring: a seven-foot-tall mast of scientific instruments bolted into the coarse shale of an outcropping known as Bishop Rock. It’s only about 130 vertical feet from the 29,032-foot summit, where one can look down the opposite side of the mountain, into China, and see another weather station about an equal distance from the top.

These installations are the highest outposts of two networks of automatic weather stations that stretch up Everest’s two popular routes. This being Everest, where controversy is no stranger, it wasn’t long before a quibble arose over bragging rights. Which station is higher: the one installed in China or the one in Nepal? The two countries share a border that divides the mountain, and officials from both claimed the honor for their nation. Perhaps Guinness World Records should investigate.

There are, of course, bigger issues at stake. With the arrival of this human infrastructure near the top of the world, our understanding of climate change on Mount Everest has reached an inflection point. The so-called Third Pole is home to the highest mountains on Earth and contains one of the largest coverings of ice outside of the North and South Polar regions. Its glaciers feed more than 10 river systems and provide water to some two billion people, roughly a quarter of the world’s population.

As these glaciers disappear, cooperation between Nepal and China will be important in understanding the rate, extent and impact of the warming in this remote and forbidding region. China has not always been inviting to outsiders on its side of Everest, which has remained closed to foreign mountaineers since the Covid pandemic began in 2020. But researchers are hopeful both countries will collaborate.

Warming in this Third Pole is happening at roughly double the global rate and has been especially pronounced over the past 60 years. This century is becoming the warmest period in these high mountains in 2,000 years, making the region an important ground for research in the effort to avert climate disaster.

This year, a comprehensive climate assessment for the Third Pole warned that twothirds of the present mass of the glaciers in the region around Everest could disappear by the year 2100. Yet as the assessment noted, there are significant “knowledge gaps” in climatic data coming from the region. This is particularly true in high-altitude environments where the annual snows collect atop the region’s myriad glaciers.

The difficulties in collecting reliable geophysical data in this daunting place are obvious and manyfold. But in recent decades a growing number of scientists have undertaken the challenge. In the spring of 2019, the National Geographic Society, working with the government of Nepal and the watch maker Rolex, helped organize a multidisciplinary expedition of more than 30 scientists from universities and organizations around the world. I was a member of that expedition, helping to document its work. New discoveries from our undertaking and from others are yielding an astonishing picture of a landscape in flux.

For instance: An ice core extracted at an altitude above 26,000 feet from the South Col, Everest’s highest glacier, showed that the ice at the surface was approximately 2,000 years old, meaning that ice that had accumulated afterward, which might have risen to a height of 180 feet, had vanished. Mountaineers on

Everest also appear to have taken a heavy toll. Snow samples revealed the presence of microplastics nearly all the way up the mountain, and snow and water samples from Everest were laden with PFAS, long-lasting chemicals widely used by a range of industries and in consumer products.

The achievements of China’s high-altitude scientists on the north side of Everest have also been impressive. Over the years, they have assembled a comprehensive climatic history of the region. Indeed, the most experienced of the Everest climate scientists is likely Shichang Kang of China’s State Key Laboratory of Cryospheric Sciences. Dr. Kang began working in the Everest region in 1997 and has made 11 scientific expeditions above 21,300 feet. The Chinese are “much tougher” than their Western counterparts, Paul

Mayewski, a glaciologist from the University of Maine who helped lead the National Geographic effort, told me. Dr. Kang was a former student of his.

The Chinese weather stations are only one part of a major research effort by the country that reportedly involved more than 270 researchers who conducted field studies in the region this past spring. Underscoring the pace of the changes on the mountain, Nepal announced last week that it will move the location of its Everest base camp at 17,600 feet on the Khumbu Glacier to a new site some 650 to 1,300 feet lower on the mountain. Hundreds of climbers use the base camp to rest, become adjusted to the altitude and prepare for their climbs. But researchers say the glacier is destabilising so quickly that it is no longer smart to camp on its surface.

The Nepal project has committed to sharing much of its data in real time. It’s unclear whether the Chinese will do so. Dr. Mayewski said he is optimistic that China will share its research on the changing climate at the world’s highest elevations. An example from Claude Lorius, the patron saint of ice coring, shows how cooperation is vital to scientific discovery. In “Ice and the Sky,” his exceptional 2015 documentary about global warming, Dr. Lorius talked about an expedition he made to Vostok, the isolated Soviet base near the South Geomagnetic Pole, in the 1980s.

Pointing to the international cast involved, he recalled “American logistics for French researchers on a Soviet base in the middle of the Cold War, in the world’s most remote region.” To him, it was “living proof that science is above political divisions.” Let’s hope the spirit of Claude Lorius prevails.

Wilkinson is a writer and co-director of the documentary “The Sanctity of Space”