Everyone loves chocolate. But for thousands of people, chocolate is the reason for their enslavement.

The chocolate bar you snack on likely starts at a plant in a West African cocoa plantation, and often the people who harvest it are children. Many are slaves to a system that produces something almost all of us consume and enjoy.

The CNN Freedom Project sent correspondent David McKenzie into the heart of the Ivory Coast - the world’s largest cocoa producer - to investigate what's happening to children working in the fields.

His work has resulted in a shocking, eye-opening documentary showing that despite all the promises the global chocolate industry made a decade ago, much of the trade remains unchanged. There are still child slaves harvesting cocoa, even though some have never even tasted chocolate and some don't even know what the word "chocolate" means.

In the documentary "Chocolate’s Child Slaves," CNN discovers a human trafficking network and farmers using child labor for an industry offering low prices and little more than broken promises. Watch an excerpt above about Abdul, 10, who has been working in the fields for three years.

Below, watch as Toure, a leader of a Cocoa cooperative deep in the Ivory Coast, readily admits that children are working in the area:



In another clip from the documentary, a cocoa farmer who doesn't use child labor weighs in on government promises.



The documentary first airs on Friday, January 20 on CNN International. As you now ponder the injustices chocolate can cause, are you considering checking your next chocolate purchase for a fair-trade label? Can that seemingly inconsequential action of looking at a label spur a chain of events? Or do you think it takes more than a label to change an industry? We'll also find out what the chocolate industry says about all this in a discussion airing after the documentary.

Chocolate’s Child Slaves premieres Friday 20th January 2012: 8.00pm GMT, 9.00pm CET

Friday 1/20/12

London 20:00

Berlin/CET 21:00

Abu Dhabi Midnight

Saturday 1/21/12

Hong Kong 22:00

Abu Dhabi 18:00

New York/Miami 9pm

Mexico City 8pm

Sunday 1/22/12

Hong Kong 18:30

London 21:30

Berlin/CET 22:30

New York/Miami 11pm

Mexico City 10pm

Tuesday 1/24/12

Hong Kong 18:30

London 17:30

Berlin/CET 18:30

Abu Dhabi 21:30