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On the threshold of the twenty-first century, the ordinary Japanese citizen has become acutely aware that various environmental hazards pose a serious threat to daily life; such hazards include the problems of waste disposal, dioxin and other substances that disturb humans' endocrine balance. Who, a mere decade ago when these problems were first brought to our attention, would have anticipated that these environmental problems would so quickly become so common and so serious? At the same time, environmental problems on a global scale, such as ozone depreciation by chlorofluorocarbons (CFCs),...