摘要
About 41%of the world's land surface is dry.These dry areas are readily affected by natural factors such as climate change and human factors such as excess agricultural and livestock activities and deforestation.In arid,semi-arid and semi-
About 41%of the world＇s land surface is dry.These dry areas are readily affected by natural factors such as climate change and human factors such as excess agricultural and livestock activities and deforestation.
