So Elizabeth Edwards announced that she'll no longer eat tangerines because of the distance they need to be shipped and the attendant environmental impact. Ridiculous? Sure, but that's not surprise. But good news Elizabeth, turns out you don't have to sacrifice after all:
The case for local food is several-fold: It tastes better, its proponents argue, and preserves species biodiversity. It shores up small-scale economies and communities in the face of globalization and cultural homogenization. It even, some of its advocates claim, protects against terrorism: a decentralized food system could limit the impact of a virus or other bio-agent introduced into the food supply.
One of the arguments most often heard, however, is about energy. And at a time of rising concern about climate change, the great distances that most of our food travels are a potent symbol of the system's profligacy and cost in greenhouse gases. For local-food activists, "food miles" have become a favored measure of environmental impact. Food activists in the US and especially in Western Europe have pushed to put the term on menus and grocery-store labels.
"[T]he typical item of food on an American's plate travels some fifteen hundred miles to get there," Michael Pollan writes in "The Omnivore's Dilemma," "and is frequently better traveled and more worldly than its eater."
But a gathering body of evidence suggests that local food can sometimes consume more energy -- and produce more greenhouse gases -- than food imported from great distances. Moving food by train or ship is quite efficient, pound for pound, and transportation can often be a relatively small part of the total energy "footprint" of food compared with growing, packaging, or, for that matter, cooking it. A head of lettuce grown in Vermont may have less of an energy impact than one shipped up from Chile. But grow that Vermont lettuce late in the season in a heated greenhouse and its energy impact leapfrogs the imported option. So while local food may have its benefits, helping with climate change is not always one of them.
(via Marginal Revolution)
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