Montreal Protocol (1973) and the international agreement signed (1985 & 1987). The treaty is structured around several groups of halogenated hydrocarbons that deplete stratospheric ozone. All of the ozone depleting substances controlled by the Montreal Protocol contain either chlorine or bromine (substances containing only fluorine do not harm the ozone layer). Some ozone-depleting substances (ODSs) are not yet controlled by the Montreal Protocol, including nitrous oxide (N2O) For a table of ozone-depleting substances controlled by the Montreal Protocol see: For each group of ODSs, the treaty provides a timetable on which the production of those substances must be shot out and eventually
The Rise and Fall of English Montreal The Rise and Fall of English Montreal The Rise and Fall of English Montreal is a 1993 Canadian documentary film directed by William Weintraub and produced by the National Film Board of Canada in Montreal. The film deals with exodus of English-speaking Quebecers that began in the 1960s and was accelerated by the Quebec general election, 1976. The film includes interviews with English-speaking professionals and students that are preparing to leave Montreal, joining an exodus of 300,000 anglophones that left the province in the last two decades. This exodus is reflected in over 100 English-speaking schools that have closed in