Icelandic seventh-grader Lilja Einarsdottir is on an unusual field trip with her class: they’re measuring the Solheimajokull glacier to see how much it has shrunk in the past year, witnessing climate change first-hand. “It is very beautiful but at the same time it is very sad to see how much it has melted,” says Lilja, bundled up against the autumn chill in a blue pompom hat. Each October since 2010, now-retired schoolteacher Jon Stefansson has brought students aged around 13 from a school in Hvolsvollur — a village about 60 kilometres (40 miles) away — to the glacier to record its evolution. The results are chilling: nestled between two moss-covered mountain slopes, Solheimajokull has shrunk by an average of 40 metres (130 feet) per year in the past decade, according to the students’ measurements. On this blustery October day, the youngsters — armed with a GPS, a measuring tape and two yellow flags — calculate the distances on foot from various spots, struggling against strong winds. Once done, some of the students hop in a dinghy and cross a lake of brown meltwater to reach an imposing wall of ice, the so-called terminus, or front of the glacier. Here, they determine the gap between the terminus and a handpainted sign at the end of a footpath, where previous students have recorded their measurements over the years. The numbers on the sign, pitched in black sand and steadied at the base by a pile of stones, indicate how many metres of ice have disappeared over the past years: “24”, “50”, “110”. “When (the first students) started here, you couldn’t see any water. So it (the glacier) was very big at first,” says Lilja. 400 glaciers under threat Glaciers cover about 11 percent of Iceland’s surface, including Vatnajokull, the largest ice cap in Europe. But they have lost about 250 cubic kilometres of ice in the past 25 years, or the equivalent of seven percent of their total volume. “Now we have lakes that are forming in front of many of them,” says glaciologist Hrafnhildur Hannesdottir of the Icelandic Meteorological Office. Iceland in August unveiled a plaque commemorating the country’s Okjokull glacier, the first to be stripped of its glacier status in 2014. The plaque was meant as a wake-up call on the effects of global warming as scientists fear the island’s 400-plus glaciers could be gone by 2200. Solheimajokull, where the students go, is a popular tourist spot as it is one of the closest to Reykjavik, only 150 kilometres away. Icelandic Mountain Guides, one of three operators that runs year-round visits, had 27,000 clients in 2018. Solheimajokull, about 10 kilometres long and two kilometres wide, is an outlet glacier of Myrdalsjokull, the country’s fourth-biggest ice cap. Under the ice here lies Katla, one of Iceland’s most powerful volcanoes, which last erupted in 1901 and is long overdue to do so again, scientists say.