CHAPTER TWO Reading POLLUTUO FIGHTERS Judy is collecting some facts for a class project on pollution. She is interviewing Doctor Ray,a scientist,about trees. Why are you so interested in trees,Doctor Ray? Dr ray:They're the biggest and oldest living things on earth,Judy. Yes,but what good are trees? They make streets more beautiful and less noisy,but what else can they do? Well,there's wood in your pencil and the bench, rubber on the end of your pencil, and paper in your notebook—all from trees. do you like to eat an orange,or sip a Coke or a coffee? Sometimes. Well,the fruit,the nuts for the Coke, and the beans for the coffee all come from trees. And,I suppose you also enjoy breathing pure,cool air. Of course. Then you must thank trees for that,too. Trees are natural air conditioners. They take harmful gas from the air,and release oxygen into the air. How many people are there in your class,Judy? Forty-six. Well,one and a half hectares of trees could produce enough oxygen to keep your whole class alive and healthy for a year.