ABSTRACT
The atmosphere has served as a sink for emissions of volcanoes and a variety of geological processes, forest and grassland res, and decomposition and other biological processes for hundreds of millions (if not billions) of years. It has also served as a sink for pollutants generated by human activities, proceeding from man’s rst use of re to the smelting of metal ores and use of fossil fuels such as coal, oil, and natural gas to motor vehicle and other emissions from our very industrialized and technologically advanced modern times.
