It's a common and accepted trope that free trade has led to more prosperity.  Yet free trade, and another word that often accompanies it – globalisation – are frequent targets of criticism, with both seen as eroding national sovereignty, taking away local jobs and harming the environment. Charles Pellegrin talks to John W.H. Denton, the secretary general of the International Chamber of Commerce, the world's largest business organisation, whose purpose is to fight for a business-friendly environment around the globe.