The Coming and Going of Glaciers: A New Alpine Melt Theory
The Alpine glaciers are shrinking, that much we know. But new research suggests that in the time of the Roman Empire, they were smaller than today. And 7,000 years ago they probably weren't around at all. A group of climatologists have come up with a controversial new theory on how the Alps must have looked over the ages.
Ulrich Joerin, a wiry Swiss scientist in his late twenties, is part of a small group of climatologists who are in the process of radically changing the image of the Swiss mountain world. He and a colleague are standing in front of the Tschierva Glacier in Engadin, Switzerland at 2,200 meters (7,217 feet). "A few thousand years ago, there were no glaciers here at all," he says. "Back then we would have been standing in the middle of a forest." He digs into the ground with his mountain boot until something dark appears: an old tree trunk, covered in ice, polished by water and almost black with humidity. "And here is the proof," says Joerin.
The glaciers, according to the new hypothesis, have shrunk down to almost nothing at least ten times since the last ice age 10,000 years ago. "At the time of the Roman Empire, for example, the glacier tongue was about 300 meters higher than today," says Joerin. Indeed, Hannibal probably never saw a single big chunk of ice when he was crossing the Alps with his army.
Joerin admits his theory goes against conventional wisdom. "It is hard to imagine that the glaciers, as we know them, were not the norm in past millennia, but rather an exception," he says while he and his companions dig out the tree trunk with shovels, axes and bare hands.
Indeed, critics accuse him and his colleagues of relying on a thin and ambivalent layer of facts. The Green Alpinists respond to the argument their own way: with a large orange chain saw. Kurt Nicolussi, a slender man in his late 40s, slices a slab of wood as large as a wiener schnitzel out of the trunk and analyzes it. "At least 400 annual rings, well preserved, perhaps the best sample we have ever had," he declares proudly.