Meltwater from the island’s ice sheet is loaded with the right kind of sand for concrete production—which further warms the planet.
That sediment is special, indeed. Desert sand from, say, the Sahara is no good for making concrete because it’s too rounded and uniform. Over millennia, winds push those grains around, polishing them. If you make concrete out of such sand, “it's almost like building with marbles,” says Bendixen. “You want particles that are more angular in shape, not rounded. And that type of material is exactly what you get from rivers, for example, or material that has been deposited by glaciers.
Currently, dredging boats suck up sediment along the coast and filter out the sand, which is then brought back onshore. But if Greenland decides to scale up sand extraction for export, that would mean big ships would have to haul the stuff away to international ports. “It's important to stress that if you extract whatever natural resource, there will be environmental consequences,” says Bendixen. “But really, here the environmental consequences can be super broad.
For one, those big ships will also be bringing in ballast, or the water they’ve collected from elsewhere and stored in their hulls for balance. If that ballast is released off the coast of Greenland, it may introduce invasive species. And, of course, dredging coastal sediments would further endanger underwater native creatures—and on land, increased mining operations might scare away the game that Inuit hunters rely on.
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