Jake Kanter International TV EditorEXCLUSIVE: Oscar-nominated 12 Years A Slave actor Chiwetel Ejiofor is to narrate a film about the world’s water shortage crisis, which is funded by an executive from Chinese tech giant Tencent and co-directed by Emmy-winner Kevin Sim.Housed at Keo Films and OoS Pictures, Day Zero is the brainchild of Tencent’s chief exploration officer David Wallerstein, who personally financed the production after becoming fascinated by the status of Earth’s water