A recently released study compared the life-cycle inventory and greenhouse gas (GHG) emissions of polystyrene (PS), paperboard, and corn-based (polylactic: PLA) cups, plates and sandwich containers. The study found that PS containers use "significantly less energy and water" since PS weighs less. However, the GHG emissions of PS containers are "slightly more" than PLA products. If paperboard products do not degrade after being thrown away, they store carbon and generate fewer emissions than PS products, but if they do degrade they generate more emissions.
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