Most plastic cups are designed for single uses and then disposal or recycling. A life cycle inventory of a comparison of paper and plastic shows environmental effects of both with no clear winner.
Production of 1 tonne (0.98 long tons; 1.1 short tons) of plastic cup emits 135 pounds (61 kg) of green house gases.
The choice between paper cups and plastic cups has to do with the life of the item after use. A paper cup may biodegrade faster than a expanded polystyrene (EPS) foam cup or a plastic cup. In general cardboard or paper takes one to three months for biodegradation, as the majority of the content, up to 95%, is made with wood chips. A plastic cup can take up to 90 years to biodegrade, depending on the type of plastic.
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