Paper cups are made from trees, which can be replanted. A paper cup would take no more than a year to decompse in a landfill.
Plastic mugs use petroleum. It takes 450 years for a plastic bottle to decompose. How long would a thick, dual-walled hard plastic mug take?
Both could be recycled, although many facilities do not accept them. Some Tim Hortons in Canada now have paper cup recycling bins.
(Source for decomposition rates: http://www.solcomhouse.com/recycling.htm)
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