The small African region with more refugees than all of Europe

Hunger follows displaced people around north-east Nigeria, as Boko Haram and climate change drive millions from their homes

As Ali Kawu eases his handcart to a halt on a recent morning in north-east Nigeria, it is the first time he has dared to stop walking in more than 24 hours.

A day earlier, at 8am, Boko Haram militants raided his village. Kawu, 25, escaped with what he could – his wife, their three children, and kindling for a fire. They left behind their papers, six sacks of beans, up to 15 dead neighbours, and 10 kidnapped villagers. Then they walked all day and all night.