Pope Francis speaks as he leads the weekly audience in Saint Peter's Square at the Vatican September 21, 2016. REUTERS/Remo Casilli

Ground Alberta beef is seen before packaging at Bon Ton Meat Market in Calgary, Alberta, October 3, 2012. REUTERS/Todd Korol

Henry Acosta, a mediator between the Marxist FARC rebels and the government, gestures during an interview with Reuters in Cali, Colombia September 17, 2016. Picture taken September 17, 2016. REUTERS/Jaime Saldarriaga

Henry Acosta, a mediator between the Marxist FARC rebels and the government, gestures during an interview with Reuters in Cali, Colombia September 17, 2016. Picture taken September 17, 2016. REUTERS/Jaime Saldarriaga

Henry Acosta, a mediator between the Marxist FARC rebels and the government, gestures during an interview with Reuters in Cali, Colombia September 17, 2016. REUTERS/Jaime Saldarriaga

The Geneva Ports Francs (Free Ports) building is pictured in Geneva, Switzerland September 6, 2016. REUTERS/Denis Balibouse

A "handle with care" sign is pictured on a box containing art at Geneva Ports Francs (Free Ports) during a media visit in Geneva, Switzerland September 6, 2016. REUTERS/Denis Balibouse

An easel is pictured inside a private showroom in a warehouse of Geneva Ports Francs (Free Ports) during a media visit in Geneva, Switzerland September 6, 2016. REUTERS/Denis Balibouse