Saving the Earth

摘要：

As time goes by,humans are making the Earth sick.People cut down too many trees and leave more and more rubbish here and there.Factories let out their waste without doing anything to it.All of these have caused many serious problems.More and more good land has turned into deserts.Rivers and lakes have been polluted and the water in them becomes dirty and poisonous.

在线出版日期：2018-03-28（万方平台首次上网日期，不代表论文的发表时间）

页数：共1页

页码：54