The plan is to phase them out by 2020.
Dunkin' Donuts aims to ditch foam cups for paper by 2020
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Dunkin' Donuts to stop using foam cups by 2020
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Dunkin' Donuts to switch to paper cups by 2020, Business
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Dunkin' Donuts says goodbye to foam cups
Farewell to Foam: Dunkin' Completes Global Transition to Paper Cups