Today， pollution has bcom a srious problm to us. It mans that th air， sas， rivrs and land ar pollutd by wast or poisonous things. It dos harm not only to human bings but also to animals （It dos harm to animals， as wll as human bings.）。

W cannot hav frsh air bcaus many factoris hav th poisonous smok snt into th air. Bautiful parks ar mad dirty by plastic tins and bags. Fish di from th pollutd watr. It is said that strang disass hav appard in som placs bcaus of pollution.

I hop scintists can find ways to solv th srious problm. W ar looking forward to sing th clar sky， clan rivrs and bautiful parks again.