Ghana's Child Slaves

Ed Butler reports from Ghana where thousands of children are believed to work as slaves in the country's fishing industry. He speaks to a former slave, and the people who rescued him. Plus, Andrew Wallis from UK charity Unseen discusses the global scale of modern slavery, and Taner Kodanaz from DigitalGlobe explains how mapping and crowdsourcing could tackle the problem.

(Photo: Fishing boats on the Ghanaian coast)