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> It also costs less in CO2 costs to ship that lamb from NZ to a supermarket than to truck it in from a local farm to your fancy organic farmer's market.

How does the lamb get from the port to the grocery store? Is the port not roughly equidistant from the point of sale as the local farm? How is the “fancy organic farmers market” less efficient to ship to in the last mile before the point of sale?

Well that all depends on the exact numbers, doesn't it? But someone going to the farmers market twice as often as they'd need to go to the supermarket (because that produce doesn't last as long, although that mostly because of less efficient processing methods in small farms) is already almost surely polluting more than the person going to the supermarket.

That's not even mentioning the savings that can be had from home delivery. Although I had a local organic pig farmer deliver meat at home just yesterday, so that's not an advantage exclusive to large players (provided he has enough customers to do multiple drops on one tour - I should've asked him, come to think of it).

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