Refrigeration
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
Collections:
Religious Studies, Education, Psychology, History, Literature, Philosophy, Entire Library
...the CFCs are harmful to the ozone layer of the stratosphere...by international treaty, the Montreal Protocol , after Jan., 1996...which are less harmful to the ozone layer, are to be used in their...which are benign to the ozone layer, are expected to have...