A Letter of Appeal 呼吁信
目前环境遭到严重破坏，请写一封信呼吁大家保护环境。
Over the past years, we have witnessed destructions of various kinds caused by human actions. As a university student, write a letter to our society to
1)enumerate present severe condition,
2)state the necessity of social concern, and
3)suggest the counter-measures.
To everyone on our plan..