According to a vast global study published in The Guardian,
"By 2100, the Lagos- Abidjan stretch is projected to be the largest zone of continuous, dense habitation on earth, with something in the order of half a billion people".
Among these people living in the World's biggest megalopolis, millions and millions of young French-speaking African citizens impacted by post-colonial Christianity and revivalism....in a context of massive Global warming, which is directly threatening the megalopolis, boosting people to leave.
Cf. Howard W. French, "Megalopolis: how coastal west Africa will shape the coming century"