Researchers have discovered microplastics in Antarctic snow for the first time. “It’s incredibly sad, but finding microplastics in Antarctica’s fresh snow underscores the scale of plastic pollution even in the most remote regions of the world,” said Alex Aves, a student at New Zealand’s Canterbury University who co-authored the study with several scientists has performed.

Microplastics are non-biodegradable, synthetic polymers in a size range of less than five millimeters.

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Aves and her colleagues took samples in 2019 from 19 sites on the Ross Ice Shelf, which covers the southern half of Antarctica’s Ross Sea.

The result shocked her: every single sample contained microplastics. The research article was published in the science journal The Cryosphere on Wednesday.

On average, the researchers discovered 29 microplastic particles per melted liter of snow. Thirteen different types of plastic were discovered, but mostly PET (polyethylene terephthalate), which is mainly used to make plastic bottles and textile fibers.

In samples taken near research stations, the density of microplastics was almost three times higher than in samples from more remote areas.

The particles could have traveled thousands of miles through the air, but it’s just as likely that the human presence in Antarctica left a microplastic “footprint,” the researchers said.