Sub-Saharan Africa is the part of the world most affected by the dual pressure of climate change and the rapid, uncontrolled transformation of its cities into megacities.
The extreme speed and scale of urbanisation has swallowed up many former peasants, incorporating them into the vast slums of sprawling megacities.
In these unplanned, hostile urban environments, where infrastructure is at a minimum, they are exposed to the dangers posed by rising seas and heavy rains – forces that wreak havoc and cause deaths every year.
But, from Lagos in the west to Dar es Salaam in the east, slum-dwellers, the middle class, and the elite alike are fighting back against the waters.
This is a visit to the front line of their battle: to Africa’s drowning megacities.