Mines persist a century later in WWI battlefield

Mines and unexploded ordnance still afflict countries like Vietnam, Cambodia and Laos, decades after armed conflicts there have ended. In Belgium, the country's bomb disposal unit is still busy removing unexploded grenades from World War I-era battlefields. Host Marco Werman speaks with Environment Correspondent Carolyn Beeler about those bomb removal efforts, and the long-lasting impacts of unexploded munitions on local populations.