"Considering all these factors, countries felt that it was time for China to host a World Expo, and for the world to gather, showcase itself and cooperate in Shanghai."

According to the BIE, such expos are "unique global events based around international cooperation and focused on a universal theme that brings the entire world together".

Loscertales said: "In the face of global challenges, expos create awareness and mobilize citizens. From the planning phase through to the expos themselves and their aftermaths, these events are major platforms for communication that engage the public around the theme and encourage the exchange of ideas and experiences."