Devry Ilab Week 5 Environmental Sciences

Topics: Ozone depletion, Greenhouse gas, Montreal Protocol Pages: 3 (802 words) Published: April 14, 2013
Exercise 1. The Montreal Protocol and its subsequent amendments resulted in the elimination of many ozone depleting substances. A link to the Montreal Protocol can be found on the course Webliography. Identify three other "world" agreements or agencies committed to helping the world's resources (including plants, animals, and abiotic resources, such as gold and water). Summarize (paraphrase) benefits gained in detail and include links used.

Trichlorofluoromethane, dichlorotetrafluoroethane, and monochloropentafluoroethane are refrigerants restricted by the Montreal Protocol. Restrictions on their use have led to their replacement in many consumer and industrial products, including refrigerators and air conditioners. Dichlorodifluoromethane is a refrigerant and aerosol spray propellant restricted by the Montreal Protocol. Manufacturers have had to shift to using arguably more dangerous chemicals because of the ban, namely the flammable propane, n-butane, and isobutene. Some products like whipped cream or cooking spray used compressed nitrous oxide or carbon dioxide. Bromochlorodifluoromethane and bromotrifluoromethane are both “Halons” used in fire suppression, restricted by the Montreal Protocol. They have the advantage of not reacting to electrical equipment, so they can be used in areas with computers or other equipment without fear of damage. In many cases, they are being replaced by sprinklers, leading to potential damage to equipment. In some cases, alternative chemicals are being used, some of which have global warming or other side effects.

Exercise 2. Since the implementation of the Montreal Protocol, developed countries have decreased the amount of ozone destroying substances they use tremendously. A link to the Montreal Protocol can be found on the course Webliography. Reduction by the United...
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