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A worldwide ban on the production of certain ozone-destroyin

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A worldwide ban on the production of certain ozone-destroyin [#permalink] New post 13 Feb 2019, 06:20
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80% (01:01) correct 20% (01:37) wrong based on 5 sessions
A worldwide ban on the production of certain ozone-destroying chemicals would provide only an illusion of protection. Quantities of such chemicals, already produced, exist as coolants in millions of refrigerators. When they reach the ozone layer in the atmosphere, their action cannot be halted. So there is no way to prevent these chemicals from damaging the ozone layer further.

Which of the following, if true, most seriously weakens the argument above?

(A) It is impossible to measure with accuracy the quantity of ozone-destroying chemicals that exist as coolants in refrigerators.
(B) In modern societies, refrigeration of food is necessary to prevent unhealthy and potentially life-threatening conditions.
(C) Replacement chemicals that will not destroy ozone have not yet been developed and would be more expensive than the chemicals now used as coolants in refrigerators.
(D) Even if people should give up the use of refrigeration, the coolants already in existing refrigerators are a threat to atmospheric ozone.
(E) The coolants in refrigerators can be fully recovered at the end of the useful life of the refrigerators and reused
[Reveal] Spoiler: OA

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Re: A worldwide ban on the production of certain ozone-destroyin [#permalink] New post 24 Feb 2019, 21:03
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(A) The prompt uses the very vague "quantities" to describe the amount of chemicals used in refrigerators. Is that a lot? A little? It doesn't matter. The conclusion is that however much of these chemicals there are, they'll reach the ozone layer. Accuracy in measurement, then, is irrelevant.

(B) Refrigeration is necessary, yes, but are these dangerous chemicals the only means of refrigeration? But this is again irrelevant, as the argument is about the chemicals already in use, and how they will damage the ozone layer.

(C) Once more, there are chemicals that exist right now, and these chemicals are going to damage the ozone layer. That's what the argument says, and it doesn't care at all about future chemicals.

(D) This is a strengthener, making essentially the same argument as the prompt itself. The current chemicals are dangerous.

(E) This is the best answer. If the chemicals are fully recycled over and over again until the end of time, then they will never be released into the atmosphere and damage the ozone layer.
Re: A worldwide ban on the production of certain ozone-destroyin   [#permalink] 24 Feb 2019, 21:03
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A worldwide ban on the production of certain ozone-destroyin

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