急…!求篇英文短文…200字左右…关于保护环境的…高二水平…上课发言用…如题…最好开头举几个不保护环境而引发的问题…再写保护环境的重要…跪谢…

the envirent of earth has been seriously destroyed by human being.for example,many trees have been cut down and many places has been desert.many rivers have been polluted