Sustain, a U.K.-based food and farming alliance, has shown that iceberg lettuce flown from Los Angeles to London requires 127 calories of fuel for every food calorie. Sustain also reports that countries often end up swapping food instead of importing critical items that cannot be produced locally. The U.K., for example, imported 126 million liters of milk and exported 270 million liters in 1997.
Researchers at Iowa State University have found that fruits and vegetables travel an average of 1,500 miles within the U.S., a 22 percent increase since 1981.
The very essence of trade -- transporting goods from producers to consumers -- takes a toll on the environment. Free trade may appear to be the solution to many economic problems when social and environmental "externalities" are ignored. Global warming is only one such externality, but its sheer scale and complexity make it a litmus test for whether the emerging global economy can be sustained in the long run.
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