Microplastics have been found in a mountain glacier for the first time, in the latest sign of how plastics are leaving no corner of the planet untouched.

The tiny pieces, which measure less than 5 millimetres in length, have shown up in places as remote as Arctic ice before . But now Roberto Sergio Azzoni at the University of Milan and colleagues have found them on a terrestrial glacier.

Around 75 particles of microplastic per kilogram of sediment were found on the Forni …