persuasive speech topic proposal

persuasive speech topic proposal - Walid Matariyeh...

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Walid Matariyeh Persuasive Speech Topic Proposal 1. General Purpose- to persuade 2. Topic- Use depletion of the ozone 3. My speech will be a question of policy. 4. Specific Purpose- I hope to make people stop doing harmful things within the environment which may potentially lead to greater depletion of the ozone layer. 5. Central Idea- I hope to illustrate the grave consequences of more depletion in the ozone as well as the small things which can be done to help avoid this problem 6. Main Points a. Problems i. Harmful ozone depleting substances lead to the depletion of the ozone layer which in turn causes many harmful rays of sunlight to hit ground level. ii. Ozone depletion rate is increasing which is leading to more cases of skin cancer, and the depletion of many plants. b. Causes i. Industries around the world use harmful ozone depleting substances such as chlorofluorocarbons . ii. The depletion of the ozone is a world wide problem that industries all around the world are using which is ultimately leading people to focus on making money and not worrying about the ozone’s depletion. c. Solutions
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i. Limit the use of chlorofluorocarbons by replacing it with the use of substances such as HCFC-225ca/cb . ii. Have the world begin taking more measures to help limit and conserve the use of man made ozone depleting substances. 7. Preview: Today I am first going to describe the growing problem of ozone deletion, then I am going to talk about possible causes for this problem, and finally I am going to discuss ways that everyone can help solve the issue of depletion of the ozone layer. PAFT : Programme for Alternative Fluorocarbon Toxicity Testing HCFC-225ca and HCFC-225cb (two isomers of dichloropentafluoropropane) are two of a series of fluorocarbon alternatives being tested by the Programme for Alternative Fluorocarbon Toxicity Testing (PAFT). HCFC-225ca and HCFC-225cb are being considered primarily as alternatives to CFC-113 as a solvent in cleaning applications. The isomers have been commercialized as a 45/55 weight percent mixture of HCFC-225ca and HCFC- 225cb. Testing has been conducted on the separate isomers to allow characterization of the toxicity of each isomer and of the mixed isomer products.
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Summary of Testing Results HCFC-225ca and HCFC-225cb have low acute oral, dermal and inhalation toxicity. Exposure in the range of 650 to 1,000 ppm with HCFC-225ca produced effects on the liver in rodents, but a minor effect in a primate. Exposures in the range of 1,000 to 5,000 ppm with HCFC-225cb resulted in only marginal effects in rodents or a primate. Neither isomer is genotoxic. Data from acute toxicity studies demonstrate that HCFC-225ca and HCFC-225cb have very low acute toxicity. Neither isomer causes eye irritation nor dermal toxicity in standardized tests; skin application of both isomers at high doses (2,000 mg/kg body weight) produces no adverse effects. Oral administration of either isomer at high doses (5,000 mg/kg body
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persuasive speech topic proposal - Walid Matariyeh...

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