Behind the remote research huts of Sermilik ice station, a vast sheet of ice stretches north for 1,480 miles, spanning an area three times the size of France.
It is holding 10% of the worlds freshwater, water that has been frozen solid for millions of years. Its glacier calving season in the south-eastern reaches of Greenland, and the adjacent channel is full of the thunderous roars and cracks of a flotilla of icebergs breaking apart.
Across a narrow granite ravine separating the visitors hut from the main living quarters of the 40-year-old international scientists base, lab machines click and whirr through the night.
The days samples water, air, carbon, algae spin frantically around curious-looking aluminium discs. Melting ice drips slowly into assorted beakers. Struggling to adjust to the midnight sun, a team of international research scientists from Aarhus University and Germanys national research centre for solid earth sciences peer into microscopes at clues to the planets future. These are samples of glacial past and present, retrieved from the belly of the Mittivakkat glacier, which is in mortal retreat on the plateau above. To understand our origins, scientists look to the stars. To understand our eventual demise, the glacier is ground zero.
Far from being barren places, glaciers represent more than 10% of our landmass and are teeming with biodiversity. They are spawning and breeding places not just for the familiar species like whales, arctic hares and foxes, polar bears, seals and muskoxen but also for bacteria, fungi and algae that have a vital role in the planets biodiversity. This team of microbiologists is attempting to decode the lives of these hidden creatures and their links to the ice melts across the polar caps. Algae blooms, these scientists say, are turning sun-reflecting glaciers into sun-absorbing hotspots.
Long hours are spent on the glacier and even more in the makeshift labs set up in a decrepit series of huts built in the late 1960s on the edge of this lonely archipelago some 40 miles away from the nearest settlement.
Archive photographs in Greenlands capital, Nuuk, show that the Mittivakkat glaciers vast icy mouth opened out to the Arctic Ocean as recently as the 1950s. But to reach its heart in 2019 is a hike many miles inland, crossing rocky terrain in entirely unexpected 23-degree heat. Lichen and unseasonal arctic flowers line the route, as do thirsty mosquitoes, who feast on the moisture of human eyeballs, relenting only at the ice line.
Flying over a glacier by helicopter its easy to dismiss the landscape as devoid of life, but for the seven scientists at Sermilik hiking over the ice, it is a source of constant fascination for animal and plant life.
Alexandre Anesio is a professor in Arctic biogeochemistry from Aarhus University. A charismatic Brazilian, he has a rifle slung over his shoulders one of four armed researchers, all on constant vigil for the polar bears who stalk the coastline here. He is also probably the worst shot. His young doctoral students, Eva Doting and Laura Halbach, look more keen-eyed, having spent the last month preparing by shooting polar bear targets at a rifle range in Copenhagen.
On the Guardians first evening, over supper, Anesio explains with earnest patience that snow isnt universally white. Some of the last snow to lie on the surface of the earth, long after the human race is gone, might even be red. Not blood-red more a watermelon hue.
He also talks about how, in the end, the fate of our glaciers, sea-level rises and biodiversity loss, will not only come down to the excesses of the industrial age and our unbridled consumer life, but also to the influence of algae.
The sticky green residue familiar from childhood tadpole ponds, as it turns out, could be a microscopic bellwether for this age of extinction.
Each year, high on Greenlands glaciers, algae perform a remarkable migration. After spending winter deep in the snowpack as dormant cysts, they awake in spring and swim through snowmelt, dividing and photosynthesising along the route.
When they reach the surface, the algae turn black, dark green and crimson colours that come from astaxanthin, a molecular cousin of the chemical that makes sweet potato orange.
The algae produce it as a sunscreen, as it absorbs UV light. As a consequence the humble algae dramatically reduce the amount of sunlight reflected by Greenlands glaciers and increase the sunlight they absorb, darkening the snow and ice.
Most concerning for the researchers out on the glacier is the fact the algae that live on the ice surface in summer are increasingly dark brown, leading them to absorb more sunlight and exacerbate melting.
Along with his colleague Professor Liane Benning, Anesio leads a team responsible for this breakthrough discovery.
The team is now aiming to understand the mechanisms behind the algal growth, and how the organisms have adapted to live on the ice. The key question is whether the algae will grow and darken other areas of the ice sheet as the climate gets warmer. If this happens, which is what the team here in Sermilik suspect, it will mean up to 30% faster melting of the ice sheet than existing models are predicting.
In 2019 our glaciers and ice sheets [are] already being darkened by dust, soot, and ash from our industrial world, which provides the perfect home for algae to flourish, Anesio says. As the organisms reproduce, they melt even more snow, which in turn allows them to proliferate again. So its like a cycle. A very bad one.
As algae spread, the effect will be compounded, leading to even more melting.
Benning, of the German Research Centre for Geosciences or GFZ in Potsdam, was previously part of the Black and Bloom project to understand how and why the Greenland ice sheet is melting. She says algae-discoloured snow isnt just an Arctic phenomenon.
Its a global occurrence, she says. This is increasingly a problem in the Arctic, Alpine and Himalayan glaciers. Blooms of red snow and brown ice are turning up in Antarctica also. What we hope to do is spread our research out further because we believe this is a significant factor in ice melt. This is why we are back here in Greenland but we believe the work also needs to be done elsewhere.
The sound of a city block-sized portion of ice as it separates from Greenlands ice shelf is unique. A violent sonic boom is followed by an echoing machine-gun style ak-ak-ak-ak as the iceberg turns on its axis, before surrendering to the ocean with an eerie silence. There is a sadness to it.
On one single day last month, Nasas Oceans Melting Greenland project announced that Greenlands ice sheet had suffered its most substantial single-day volume loss on record, sending an estimated 12.5bn tonnes of ice pouring into the Arctic Ocean a body of water that could cover the whole of England in five inches of water. If the Greenland ice sheet disappeared tomorrow, sea levels around the world would rise by seven metres and life, as we know it, would come to an end.
Glaciers matter. And they are in universal retreat. By 2100 Alpine summits may have lost around nine-tenths of the ice that covered them in 2003. In western Canada, somewhere between 60% and 80% of the ice measured in 2005 will have disappeared and flowed into the sea. In South America, the glaciers of Bolivia have lost almost half their mass in the last 50 years.
Sermiliks scientists argue for serious thinking and funding to understand glacier loss. For Anesio, who left his job at Bristol University, transferring to Denmark because of the potential impact of Brexit on his research, science has to be something collaborative.
There is no question that the data we are seeing is concerning, he says. One of the latest predictions is that there is a 10% chance for sea levels to rise by two metres in 2100. So maybe some people think 10% is not a great chance but I dont think I would cross the street if I had a 10% chance [of being] hit by a truck.
Our job as scientists is to create more accurate models and add to our global understanding of the climate crisis so that it can be used for politicians to take action we hope, a little bit faster than is happening now.
As glaciers retreat from India to Greenland, biodiversity is being lost. According to the UN one million species face extinction due to human influence. Such a collapse in biodiversity would wreak havoc on the interconnected ecosystems of the planet, putting humans at risk by compromising food sources, fouling clean water and air, and eroding defences against extreme weather such as hurricanes and floods.
As Greenlands ice melt has been adopted by the world as a global bellwether for climate crisis, less focus is being placed on the impact on biodiversity.
This ice sheet is not just being melted by algae bloom and from above by warmer air temperatures. Arctic waters are reaching record high temperatures and warmer water is lapping against these great glaciers.
For Greenland, one of the least densely populated countries in the world, the impact will be felt on land by the nations flowers, plants, bushes and heather, its polar bears, caribous, arctic hares, foxes and wolves and at sea by narwhals, seals, bowhead whales and the large variety of unique sea birds.
This is biodiversity that actually faces few direct pressures from human activities the major threat is glacial melt and climate crisis. The shrinking of the sea ice area is already having a significant impact on marine ecosystems. Its an essential habitat and breeding ground for many species, ranging from micro-algae to marine mammals.
This is now a hungry time for polar bears struggling to access the sea ice to hunt for seals. An estimated 3,500 of the bears stalk the coastline of Greenland and at Sermilik, stories are swapped of close encounters with the animals.
Scientific labours in the chill winds and high seas of the Arctic summer seem wrapped in an unusual sense of urgency this year. The scientists working in Greenland are keen to communicate their new, emerging understanding of the dynamics of the declining ice sheet to the broader world.
According to Christopher Trivedi, a US member of the scientific team, communicating the work of the many scientists active across Greenland to local people is a vital and often overlooked part of the job. I think science communication matters. We need to include the local community here with the work we are doing, and we also have a responsibility to explain the work we are doing here. What we are finding impacts the immediate environment more than anywhere else.
For the younger members of the Sermilik team, the bleakest conversation held at the ice station is around the plastic being discovered.
We are finding plastics in the atmosphere at the centre of Greenlands ice sheet, says Dr James Bradley, assistant professor at the Queen Mary University of London. Millions of tonnes of plastic are discarded into the environment every year and are broken down into small particles and fibres that do not biodegrade. These particles, known as microplastics, have now been found everywhere from high mountains to deep oceans and can carry toxic chemicals and harmful microbes. Microplastics are tiny pieces of plastic waste. Their presence in oceans and waterways has received a great deal of scientific and media attention in recent years, but our growing concern is their presence in the atmosphere.
It is evident that all the scientists feel a growing responsibility on their shoulders to answer questions that have been ignored for too long. This summer, in the face of record ice melt, there is a deeper purpose and an urgency to their work. They want more resources and new technologies to map the details of ice loss with greater precision. They want better global monitoring of nutrients and contaminants that are now trickling at ever higher rates from glaciers into downstream waterways. They want to expand their work to Antarctica and other parts of the glacial world.
To be honest, Im massively worried, says Anesio. I just hope that we are not crossing that tipping point because I dont think humans can adapt to the rates of changing climates at the moment.
He says that he also has hope, because I can see a new movement in the young generation that cares. I think that everyone individually can contribute, by pressing politicians, but also by making their contribution in terms of the reduction of CO2.
Leaving the ice station by boat, negotiating the same narrow channel of icebergs that brought us here, we pass over the shattered remnants of a glacier and stop to scoop a 1,000-year-old chunk of ice from the water. These lumps of ice can only meet one path, drifting out into the Arctic sea at the mercy of winds and warm currents until they break apart into the ocean.
Days later, further north of the island, a local ships captain summed things up with his Greenlandic dark humour. That noise you hear out there. The fizzing and cracking, he tells me, cupping his ear to the wind for dramatic effect as his old wooden ship passes through a fjord filled with decaying mountains of ice.
That noise is the end of the world.
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