We reuse the cups at home.

Dunkin is switching to paper cups soon. I bring my own water bottle and our mugs to work, also on my daily errands. Love water.

I use em to make ice. After they are frozen. I put em in a plastic bag n smash em to small pieces. The cup peels right off. I also use em for plants over n over again. When torn into pieces they make great stuffing for mice holes

Honestly i see a WIN WIN situation!!
Most places I go give you either a price discount or a larger drink size for the same price by using a drink container you buy from them!
(a rare few will let you use a competitors drink container for the discount but you have to ask first!)
And if you watch even free refills for buying the drink container or after buying so many drinks!
"WIN WIN for all!!"

GAWD now we have to "feel good" and be "socially-conscious" about drinking coffee? Can't we do ANYthing anymore without having to "feel good" or make a point about how cool you think you are by doing what's right? And the people who have to talk or brag about. Just stop.