a life cycle analysis of kiwi fruit production shows it is also less energy demanding to ship New Zealand fruit to the UK than it is to truck fruit from Italy.
You also need to consider the type of food. For example a locally-produced pork chop is likely more energy and land intensive than importing lentils. It takes a lot of land (and therefore energy) to grow the feed crops to fatten animals.
BTW. One problem with trucks is the space they take up on highways. Perhaps we would need less highways or narrower ones if everyone ate local.
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