GREEN CHEMISTRY “is the design of chemical products and processes that reduce or eliminate the use and generation of hazardous substances. Often referred to as a form of molecular- level pollution prevention, Green Chemistry relies on a set of 12 principles that can be used to design or re-design molecules, materials and chemical transformations to be safer for human health and the environment.””
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http://greenchem.uoregon.edu/Pages/WhatIsGreenChemistry.php