Within Mali, the Bozo people are regarded as loud, colourful and gregarious. Nomadic fishermen, they move with the fish pulling into ports as they trade their fish for other basic staples. But their way of life is under threat. River levels are dropping. And that has huge consequences, not just for the Bozo people, but for the 12 million population of the country - most of whom depend on the river for survival. Even the legendary city of Timbuktu is affected. The river once ran through this the city now it is just a dry river bed. Year on year, the desert inches its way forward.