Lake Chad has shrunk by almost 90 per cent, while water levels in Lake Victoria - Africa's biggest freshwater lake - have fallen by a metre since the early 1990s. Niger has lost more than 80 per cent of its freshwater wetlands in the past 20 years. The dramatic and, in some cases damaging environmental changes sweeping Africa's lakes are brought into sharp focus in a new atlas. Produced by the United Nations Environment Programme (UNEP), the Atlas of African Lakes compares and contrasts spectacular satellite images of the past few decades with contemporary ones.