International Day for the Preservation of the Ozone Layer of the hole in the ozone layer was observed 30 years after the protocol was signed. Due to the nature of the gases responsible for ozone depletion their chemical effects are expected to continue for between 50 to 100 years. International Day for the Preservation of the Ozone Layer September 16 was designated by the United Nations General Assembly as the International Day for the Preservation of the Ozone Layer. This designation had been made on December 19, 2000, in commemoration of the date, in 1987, on which nations signed the Montreal Protocol on Substances that Deplete the Ozone Layer.
The Montreal School the texts. The Montreal School The Montreal School, as its name suggests, is a school of thought in the field of organizational communication. It was initiated by James R. Taylor and colleagues in the Department of Communication at the Université de Montréal. It origin can be traced back to the introduction in 1987 of a new doctoral program bringing together three major French-language universities in Montreal, the Université de Montréal, the Université du Québec à Montréal, and Concordia University. The Montreal School has had, and continues to have, a global resonance in Europe ) as well as on the American