环保的重要性(The importance of Protect Environment)

环保的重要性(The importance of Protect Environment)
    Seeing this picture, we know that these trees have been cut down. But as a very little baby in the picture, he must be puzzled. He will ask: What are these? Are these trees? Of course, in our imagination, trees must be tall, strong and green enough. Actually, his question shows humans a problem that is worth thinking about. The covering rate of the forest in the world has kept decreasing these years and it caused a lot of problems on environment. As we all know, trees are very important in our life. They can