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Re:Impact Campaign: SEAL Calls On Starbucks To #UpTheCup by mattharney on Wednesday August 04, 2021 @03:26PM (#28065133)
Excellent point - over 60% of the lifecycle costs of a cup are in the earlier phases (like raw materials, production, and transport).

So bringing your own cup is by FAR the best way to mitigate your own personal footprint.

Re:Impact Campaign: SEAL Calls On Starbucks To #UpTheCup by sokoloff on Wednesday August 04, 2021 @03:51PM (#28065442)
Brewing coffee at home or in the office rather than driving to Starbucks is perhaps a better way. (Disregard for those who walk to Starbucks, but I suspect a lot more environmental impact happens driving to and idling in line at the drive-to Starbucks than from the cups.)