Forrest established the Walk Free Foundation in 2010 to fight modern slavery. In 2013 the organisation launched the Global Slavery Index ranking 162 countries "based on a combined measure of three factors: estimated prevalence of modern slavery by population, a measure of child marriage, and a measure of human trafficking in and out of a country". The Index estimates there are 29 million slaves worldwide, roughly half in India and Pakistan. In January 2014, Forrest announced a deal with Pakistan to do away with more than two million slaves in return for cheap coal.