A U.N. chemical weapons expert, wearing a gas mask, holds a plastic bag containing samples from one of the sites of an alleged chemical weapons attack in the Ain Tarma neighbourhood of Damascus August 29, 2013. A team of U.N. experts left their Damascus hotel for a third day of on-site investigations into apparent chemical weapons attacks on the outskirts of the capital. Activists and doctors in rebel-held areas said the six-car U.N. convoy was scheduled to visit the scene of strikes in the eastern Ghouta suburbs. REUTERS/Mohamed Abdullah (SYRIA – Tags: POLITICS CIVIL UNREST CONFLICT TPX IMAGES OF THE DAY) – RTX1306G
Ridding Syria of its chemical weapons arsenal would be a daunting task. Paul Walker knows that from experience. The chemical weapons expert tells The World's host Marco Werman that the US–and Russia–have been dismantling their own chemical arsenals for more than two decades.