Panorama: Billionaires Behaving Badly?

Current affairs. Glencore is a commodity giant that trades huge quantities of wheat, coal and much of the world's copper. John Sweeney talks exclusively to its boss, Ivan Glasenberg, who became a billionaire five times over when the company was listed on the London stock exchange last year. But in Congo and Colombia, Glencore stands accused of reckless greed. Panorama investigates