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How long does it take a Styrofoam cup to decompose?

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It will take 400 years.
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How do you decompose styrofoam?

A styrofoam-decomposing Bacterium from Mealworms has recently been found. A certain type of bacteria living in their digestive tracts enables the mealworms to process Styrofoa

How long does it take foam - styrofoam - polystyrene to decompose?

Exposure to UV from sunlight will degrade the styrene molecule.Exposure to ambient ozone will also degrade the styrene molecule.In the sun, in a place with lots of ozone pollu