Ah, I see.
Yea I would assume its from transportation. It would help for the more simple stuff, but I agree on what you said about packaging and what not. In reality, its impossible to track the carbon footprint of anything really, since you can go forever counting the stuff the truck transporting it's made of, how that material was transported, etc.
Its a step though, and every bit counts.
I hope all that studying pays off, good luck on your midterms.
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