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

itoggle caption Bradley C. Bower/AP

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

itoggle caption Julie Rose