Do you ever order clothes online in different sizes and colors, just to try them on and then send back what doesn't work? Aparna Mehta used to do this all time, until she one day asked herself: Where do all these returned clothes go? In an eye-opening talk, she reveals the unseen world of "free" online returns -- which, instead of ending up back on the shelf, are sent to landfills by the billions of pounds each year -- and shares a plan to help put an end to this growing environmental catastrophe.

Aparna Mehta: Where do your online returns go?

Where do your online returns go?

Every year, 4 billion pounds of returned clothing ends up in landfills, a stark emblem of our disposable culture's impact.

Shopping habit revelation: 4 billion lbs of returned clothes to landfills annually. A shift to 'green turns' could save the planet.

Unveiled: 'Green turn' strategy could reroute returns directly to new buyers, averting landfill waste and reshaping consumerism.