This was actually a reason I refused to get any coffee at Dunkins even when I was visiting Boston
https://www.washingtonpost.com/news/business/wp/2018/02/07/dunkin-donuts-joins-eco-friendly-parade-will-switch-to-paper-cups-by-2020/?hpid=hp_no-name_hp-in-the-news%3Apage%2Fin-the-news&utm_term=.f19d3a2a12c7
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February 8, 2018