The basic concept of green chemistry as well as the two reasons why it is necessary (the realization of the limit of massive growth and the necessity of risk management of chemicals) and three aims are described. The aims are substantial reduction of environmental impact, the improvement of economical efficiency and performance, and the establsihment of good realtionhsip between chemistry and society. For the sound development of green chemsitry, the evaluation of overall greenness of product

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... process is indispensable. It has been pointed out that, as for green organic syntheses, the efficiencies of reaction itself and the following separation and purification steps are critical.