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# This passage is excerpted from material published in 1997. Sc

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Re: This passage is excerpted from material published in 1997. Sc  [#permalink]

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11 Nov 2018, 00:00
teaserbae wrote:
workout GMATNinja gmatexam439 AjiteshArun u1983 GMATNinjatwo @abhimanha
Can you please Q1 I read the above explaination but I am still not clear why A and D are wrong and B is correct ?
Look at it this way (I'm assuming numbers):

1. Global warming was expected (predicted by models) to be (say) 5°.
2. Actual warming observed was only (say) 2° (less than what the models predicted).
3. The disparity between predicted and actual temperature increases was 3° (5 - 2)°.

4. In the early 1990s, Michaels thought that this difference was attributable to sulfate emissions, which had a temporary cooling effect. That was the reason that the actual figure (2°) was less than the predicted figure (5°).
5. He later had doubts about this explanation, because (a) most sulfate is emitted in the Northern Hemisphere and (b) after 1987, warming in the Southern Hemisphere ceased while warming in the Northern Hemisphere increased.

The question is asking us what Michaels would have been likely to agree with in the early 1990s about the disparity mentioned in lines 3-4. The disparity mentioned in those lines is the difference between predicted and actual temperature increases.

Option A: This disparity is relatively less extreme in the Northern Hemisphere because of sulfate cooling.
Michaels did not ever think that the disparity between the predictions by the models and actual warming was less extreme in the Northern Hemisphere. In fact, we have no idea about what the models predicted for the Northern and Southern Hemispheres (separately).

Option B: This disparity is only a short-term phenomenon brought about by sulfate cooling.
This is exactly what the passage says (Michaels sought to explain this disparity, suggesting that sulfate emissions in industrial areas had a cooling effect, thus temporarily retarding global warming).

Option D: The extent of this disparity is being masked by the temporary effect of sulfate cooling.
"The extent of this disparity is masked" means that the actual disparity was greater than what was seen ("masked" means "hidden"). That is, the actual disparity was greater than (5 - 2 = 3)°. Let's say the actual disparity was 4°. That is not what Michaels thought. Michaels said that the reason that the disparity was 3° was sulfate emissions. That is, if sulfate emissions had not been present, the disparity would have been smaller, not greater, because actual global warming would have been closer to what the models predicted.
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Re: This passage is excerpted from material published in 1997. Sc  [#permalink]

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27 Mar 2019, 22:30
how much time should be taken for this passage ideally? i got all 3 right but took 10 mins.
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Re: This passage is excerpted from material published in 1997. Sc  [#permalink]

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28 Mar 2019, 06:13
sarat0994 wrote:
how much time should be taken for this passage ideally? i got all 3 right but took 10 mins.

Definitely 10 minutes for 3 questions is not an ideal time. Ideal time is under 6 minutes but as it is a 700-Level passage so 7-7.5 minutes are fare enough but not more than this.
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Re: This passage is excerpted from material published in 1997. Sc  [#permalink]

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12 Apr 2019, 04:46
For question 1 , how do we know if the disparity is a short-term phenomenon?
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Re: This passage is excerpted from material published in 1997. Sc  [#permalink]

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13 Apr 2019, 11:07
1
Leonaann wrote:
For question 1 , how do we know if the disparity is a short-term phenomenon?

Q-statement:
The passage suggests that, in the early 1990s, Michaels would have been most likely to agree with which of the following statements about the disparity mentioned in lines 3-4?

Excerpt from the passage:
In the early 1990s, Pat Michaels sought to explain this disparity,
suggesting that sulfate emissions in industrial areas had a cooling effect, thus temporarily retarding global warming.

Now, look at Option B:
This disparity is only a short-term phenomenon brought about by sulfate cooling.

The usage of the term temporarily has been coined to short-term phenomenon.
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Re: This passage is excerpted from material published in 1997. Sc   [#permalink] 13 Apr 2019, 11:07

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