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food loops

Posted by Armin on July 30, 2005

What is the meaning of food loops`in following sentences ?
Zack says the kids had to deal with the challenges of urban planning: providing clean water, proper waste disposal, sustainable energy, and mass transportation for a large city. "The robot's main task is to clean up the city. It has to get the food loops , dump 'em in the market, and then it has to get the building materials to the newly constructed building. You also have to fix the bridge and you also can't hurt the environment," he says.