It is important to protect the environment

Last Sunday, my friends and I went to the river where we used to swim in. When we got there, to our surprise, the river had been polluted seriously.Last Sunday, my friends and I went to the river where we used to swim in. When we got there, to our surprise, the river had been polluted seriously. I n my memory, the water in the river was clean and clear. But now it is very dirty. There is a lot of rubbish floating on the river. How terrible it is! I observed carefully around the river, I fo…