हरित रसायन से आप क्या समझते हैं ? यह वातावरणीय प्रदूषण को रोकने में किस प्रकार सहायक है ?

Green chemistry is a production process that aims at using the existing knowledge and principles of chemistry for developing and implementing chemical products and processes to reduce the use and generation of substances hazardous to the environment. The release of different harmful chemicals (particulates, gases, organic and inorganic wastes) causes environmental pollution. In green chemistry, the reactants to be used in chemical reactions are chosen in such a way that the yield of the end products is up to $100 \%$. This prevents or limits chemical pollutants from being introduced into the environment. Through the efforts of green chemists, $H _{2} O _{2}$ has replaced tetrachlorethane and chlorine gas in drying and bleaching of paper.