Runners tread more heavily on the earth than they may have ever imagined, especially it seems if they are wearing a pair of Chinese-made men’s size nine Asics gel Kayanos, according to a team of MIT scientists. A new pair of synthetic running shoes typically generates 30lbs of carbon dioxide emissions, the researchers found. That’s an unusually high carbon footprint for a product that does not use electricity, or require sophisticated components. The researchers said it was equivalent to leaving a 100-watt bulb burning for an entire week.
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