The world's forests become smaller and smaller. People are still cutting down the trees. Why is this happening? There are two reasons—— land and wood. People need land for animals and crops. People want wood, too. People in every country need wood. Wood is used for buildings or made into furniture. But most places in the forests are not good for animals or crops. The soil in the forests is very thin. When trees are cut down, the soil is washed away by rain or blown away by wind. Soon there is nothing left but sand. Then more land will be needed and more trees will be cut down. Who can we blame (责备) for the lost forests? The answer is: all of us. There are too many people in the world. Look around. Maybe you are lying on a bed or sitting on a chair. They are made of wood.