Zeotropic mixture harmful effects that hydrochlorofluorocarbons (HCFC) and chlorofluorocarbons (CFC) have on the ozone layer and global warming. Researchers have focused on using new mixtures that have the same properties as past refrigerants to phase out harmful halogenated substances, in accordance to the Montreal Protocol and Kyoto Protocol. For example, researchers found that zeotropic mixture R-404A can replace R-12, a CFC, in household refrigerators. However, there are some technical difficulties for using zeotropic mixtures. This includes leakages, as well as the high temperature glide associated with substances of different boiling points, though the temperature glide can be matched to the temperature difference
Montreal flood of 1987 of God". In 1988, all the cities on the Island of Montreal, regrouped into the Montreal Urban Community, set up a common "Emergencies Coordination Bureau" ("Bureau des mesures d'urgence"). In 1997, the bureau was renamed "Centre de sécurité civile". Following the Municipal reorganization in Quebec in 2002, most of the cities were regrouped into the greater Montreal and the center became the "Centre de sécurité civile de Montréal". Montreal flood of 1987 The Montreal flood of 1987 happened on July 14 of that year when a series of strong thunderstorms crossed the island of Montreal, Canada, between the noon hour