I don't think complaining about people buying $5 cups of coffee at Starbucks is helpful for making a convincing argument. When you make statements like that, you give people the impression that your true motive is to attack capitalism and that raising environmental concerns are simply an underhanded tactic to do so. I understand your point about driving, but the brand of coffee and the cost is irrelevant and complaining about it is counterproductive.

There's no reason we can't address climate change and have $5 cups of coffee at Starbucks (although I prefer $2 cups of coffee at Dunkin Donuts).