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I don't think he ever presents it as being "entirely about carbon." Here is the first sentence There is a movement of people who really want people to eat food that is produced locally. Their argument seems to be primarily about the environmental impacts of moving food long distances.
I think he has a point here. If you were to talk to a champion of the local food "movement" and ask them why it's important, I would guess this would be the first reason given. It's not the only drum they beat, but it's often the one that's beat on the loudest. -From my experience.