(CNN) They're in our oceans, soil, air, snow - and even in your cup of tea.
Plastic tea bags are shedding billions of shards of microplastics into their water, according to a new study.
Researchers at McGill University in Canada analysed the effects of placing four different commercial tea bags into boiling water.
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They found that a single bag releases around 11.6 billion microplastic particles, and 3.1 billion even smaller nanoplastic particles, into the cup - thousands of times higher than the amount of plastic previously found in other food and drink.