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.
Credit Julie Rose
Organic waste ends up in a series of 50-foot beds where the worms do their work. Castings (aka worm poop) fall through a screen at the bottom of the bed and will be used as fertilizer on airport grounds.