Similar Material g76 11/22 pp. 20-22 What Has Happened to the Rhine? Bacteria—Some Harmful, Many Helpful Awake!—1973 Bacteria—Helpful or Harmful? Awake!—1978 Water, Water Everywhere—But How Pure Is It? Awake!—1971 Pure Water—A Wonder of Nature Awake!—1981 The Ugly Side of Industrial Chemicals Awake!—1987 Those Frightening Chemical Wastes—Is There an Answer? Awake!—1980 The Water You Drink Awake!—1976 Tracking Down the Causes of Pollution Awake!—1988 Pollution’s Deadly Harvest Awake!—1988 What Is Man Doing to the Earth? The Watchtower Announcing Jehovah’s Kingdom—1990