Well the answer to this question is desertifaction is when deserts expand and swallow everything in its path which is why there is so less land.
Many things
It is caused by desertifacation.
it is happening in the Sahel region
Mali's problems is the increaseng desertifacation of the country and the lack of water and also the nations wildlife is threatened by drought
desertifacation,deforestation,soil erosion drought, and not enough water