This sentence suggets what might happen in the future if the earth's ozone layer continues to get depleted. A term called "ozone depletion" is defined in this sentence via commas that separate the word from the definition "the continuous wearing of the Earth's ozone layer."
The sentence suggests there are two potential ramifications of this continual wearing of the ozone layer. One suggests an impact on the health of human beings via the hazardous ultraviolet rays that enter the Earth's atmosphere as a result of ozone depletion. The other suggests the gradual increase in the Earth's overall temperature.
These two reasons need to be positioned in the sentence in such a way that makes sense. Your job is to pick from the available 5 choices and choose which answer choice best fits the underlined portion of the sentence.
Note this is a split sentence with two commas in the middle portion of the sentence. If you can cut the fluff, you can more easily read what the sentence is saying and better see what it is testing you on.
source: GMAT Pill
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