The digester eggs at Newtown Creek Wastewater Treatment Plant in Brooklyn contain millions of gallons of black sludge. Courtesy of New York City Department of Environmental Protection hide caption

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Roger Gordon (left) is offered a box of bananas from a worker who was throwing away the lightly speckled fruit at Mexican Fruits in Washington, D.C. Gordon's startup, Food Cowboy, works with truckers to divert edible produce from landfills to food charities. Serri Graslie/NPR hide caption

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Tristram Stuart, founder of Feeding the 5000, is helping to organize several disco soup events across Europe for World Food Day. /Courtesy of Feeding the 5000 hide caption

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Doug Rauch wants to take wholesome food that grocers have to throw away and cook and sell it as low-cost, prepared meals. Bunnyhero/Flickr hide caption

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At her bakery in Costa Mesa, Calif., Rachel Klemek sells cabernet brownies made with a flour substitute derived from grape pomace, a byproduct of winemaking packed with nutrients known as polyphenols. Mariana Dale/NPR hide caption

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Compost bins at the Grand Army Plaza Greenmarket in Brooklyn, N.Y. are part of a pilot program to get New Yorkers to recycle their food waste. Courtesy of Grand Army Plaza Greenmarket hide caption

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A worker dumps a bucket of tomatoes into a trailer in Florida City, Fla. Much of the lost and wasted weight in fruits and vegetables is water, according to a report by the World Resources Institute. Joe Raedle/Getty Images hide caption

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Got spaghetti? Dogs digest starch more efficiently than their wolf ancestors, which may have been an important step during dog domestication. Lauren Solomon/ Moore /Courtesy of Nature hide caption

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A 1,000-pound butter sculpture is unveiled at the 97th Pennsylvania Farm Show in Harrisburg last week. Bradley C. Bower/AP hide caption

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The Austrians behind Waste Cooking want to show the culinary possibilities of food that ends up in the trash. Courtesy hide caption

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Charlotte Douglas International Airport has deployed an army of 1.9 million worms to eat through its organic waste. The airport has reduced the trash it sends to the landfill by 70 percent. Julie Rose hide caption

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