Many years ago, my hometown is a beautify town, it was surronded by green trees, when you walked by the clear river, you could see fish swimming freely, the houses people lived were not so good, it was poor, and peoper were not so rich, they worked hard to improve their life. Things are different today. Now, lots of modern buildings are build up,also lots of bill boards are erected,and you can see many cars are raning on the roday. These days, industry developmention are staining the envirenvironment, and the trees are decreasing, the fish are disappearing. In my opinion, fighting against pollution is the most important thing we should do.