ABSTRACT
Along with an increasing awareness of the importance of the environment has come a deeper understanding that the environment is a global issue. For example, the inhabitants of the Earth share the same air (although there is minimal exchange between the Northern and Southern hemispheres), and some of the air over the United States might be over India in a few months, and vice versa. The harmful effects of air pollutants—agricultural damage, global climate change, acid deposition, etc.—know no political boundaries.
