The 4,700-mile long line of trees designed stop Sahara's advance would be the world's largest living structure.
원문출처 : http://www.cnn.com/2016/09/22/africa/great-green-wall-sahara/index.html
원문출처 : http://www.cnn.com/2016/09/22/africa/great-green-wall-sahara/index.html