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.)
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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.
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.)