As time goes by, man is making the earth sick. People cut down too manytrees and leave rubbish everywhere. Factories let out their waste without doinganying to it . This has cause some serious problems. Such as the land is sandy,the river is dirty, the air is less clean, even the temperature of the earth isrising. What should we do to save the earth ? My suggestion is that we shouldplant more trees, put rubbish into dusbins and stop factories pouring wastedirectly into the air or rivers. In all, we have only one earth, we should doour best to protect it, or we will regret.