the area of desert in the world is growing every year.many parts of the world which once had large populations and produced plenty of crops, have become deserts. dunhuang in
china, deep in the heart of the gebi desert, was once a great city. cattle are one cause of the problem. in good years, famers increase the numbers of their cattle. then one year, the rains fail to come. the farmers do not want to kill any of their cattle, so the cattle eat all the grass and anything that grows rains fail to come. the farmers do not want to kill any of their cattle, so the cattle eat all the grass and anything that grows on poorer land. if this continues for several years, the grass never grows again and the land becomes a desert. one suggested answer is for farmers to limit the numbers