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Microplastics in the ocean: a climate change crisis we ignore
When we think of plastic pollution we think of huge semi-solid islands of rubbish in the ocean — but unfolding alongside the overtly visible “macroplastic” crisis is another threat caused by much smaller particles, explains JOSEPH WINTERS
The environmental activist Modou Fall, who many simply call Plastic Man, poses for a photo at the devastated Yarakh Beach in Dakar, Senegal, November 8, 2022. On his chest, poking out from the plastic, is a sign in French that says simply, “no to plastic bags.”

MICROPLASTICS, tiny plastic fragments that are less than 5mm in diameter, have become ubiquitous in the environment. They form when larger plastic items like water bottles, plastic bags, and food wrappers are exposed to the elements, chipping them into smaller and smaller pieces as they degrade. Smaller plastic fragments can get down into the nano territory, spanning just 0.000001mm — a tiny fraction of the width of a human hair.

These plastic particles do many of the same bad things that larger plastic items do: mar the land and sea and leak toxic chemicals into the food chain. But scientists are increasingly worried about their potential impact on the global climate.  

Not only do microplastics release potent greenhouse gases as they break down, but they also may be inhibiting one of the world’s most important carbon sinks, preventing planet-warming carbon molecules from being locked away in the seafloor.

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