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Many global environmental issues of present days, such as, global warming, climate change, ozone destruction, acid rainfall etc. are derived from atmospheric composition changes caused by the anthropogenic activity, and in order to solve global environmental issues, it is absolutely necessary to elucidate the mechanism of such changes and to make precision of future prediction higher. Moreover, the occurring atmospheric composition changes might generate unknown global environmental issues, and it is a great role of atmospheric composition change research to send out an early warning corresponding to these issues.