求英语作文\x0c人类乱砍伐树木、乱扔垃圾、工厂不加处理排放废物\x0c导致问题　土地沙漠化、河水变脏、空...

As the time gose by ,man makes the earth sick . people cut down too many trees and leave litters here and there . factories pour waste water into the river without doing anything .
it has