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A zero-CO2 U.S. economy can be achieved within the next thirty to fift

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New post Updated on: 18 Dec 2018, 05:44
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A zero-CO2 U.S. economy can be achieved within the next thirty to fifty years without the use of nuclear power. The U.S. renewable energy resource base is vast and practically untapped. Available wind energy resources in 12 Midwestern and Rocky Mountain states equal about 2.5 times the entire electricity production of the United States. Given that we can satisfy our electricity needs by harnessing only 40% of the wind energy resources in these 12 states, it is extremely likely that we will be able to do away with CO2.

Which of the following would be most useful to evaluate the above argument?


A. What is the amount of wind energy resources available in rest of the states in the United States?

B. Are there any other renewable energy resources such as solar power, which can be used?

C. With the use of current technologies, what proportion of electricity generated through wind energy can be stored for use at future times when wind may not be blowing?

D. Are there strong corporate lobbies which will strongly oppose any move to substitute non-renewable sources of energy?

E. What proportion of wind energy is available only at inaccessible areas?


Hi Everyone,

Here's another question from e-GMAT. It is an evaluate question type, which, as experience of recent test takers suggest, is becoming more important on GMAT.

Share your answers with analysis. Looking forward to a healthy discussion :)

-Chiranjeev Singh

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Originally posted by egmat on 02 Sep 2013, 01:15.
Last edited by Bunuel on 18 Dec 2018, 05:44, edited 5 times in total.
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Re: A zero-CO2 U.S. economy can be achieved within the next thirty to fift  [#permalink]

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New post 06 Sep 2013, 03:16
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heman2727 wrote:
egmat wrote:
OA has been posted. It is option E. People in this thread who chose option E have given correct explanations for the same.

Let me know if anyone still has doubts :)

Thanks,
Chiranjeev


Can we discuss why C is not the correct answer. I want to discuss so that I can have more clear thought process.

Regards,
Himanshu

Hi Himanshu,

Good that you brought this up. A lot of students marked choice C.

C. With the use of current technologies, what proportion of electricity generated through wind energy can be stored for use at future times when wind may not be blowing?

So, option C asks what proportion of electricity can be stored?

Now, tell me what proportion do we want?

The answer is: We don't know.

Nowhere the passage talks about the times in which wind is not blowing. If the passage had said. let's say, that the wind does not blow for one month every year, then in that case, we would have wanted to store 1/11th of the electricity. In that case, it might have made sense to know how much electricity we can store.

But the given passage does not talk about a scenario in which the wind does not blow. Rather, we don't even know if there is a period in which doesn't blow. Probably, the wind blows all the time. We don't know. In such a scenario, option C does not help us evaluate the argument.

On the other hand, option E is extremely relevant to the argument. We require 40% of wind energy. Right? How much can we access? Less than or more than 40%? This is what option E asks.

Frankly, option C was specially crafted with a lot of relevant and common sense words to confuse students :wink: and placed before the correct choice so that when students read the correct choice, they read it with a bias against the correct choice (because in their mind, they have already found the correct choice) :wink:

Thanks,
Chiranjeev
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Re: A zero-CO2 U.S. economy can be achieved within the next thirty to fift  [#permalink]

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New post 02 Sep 2013, 14:37
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egmat wrote:
Hi Everyone,

Here's another question from e-GMAT. It is an evaluate question type, which, as experience of recent test takers suggest, is becoming more important on GMAT.

Share your answers with analysis. Looking forward to a health discussion :)

A zero-CO2 U.S. economy can be achieved within the next thirty to fifty years without the use of nuclear power. The U.S. renewable energy resource base is vast and practically untapped. Available wind energy resources in 12 Midwestern and Rocky Mountain states equal about 2.5 times the entire electricity production of the United States. Given that we can satisfy our electricity needs by harnessing only 40% of the wind energy resources in these 12 states, it is extremely likely that we will be able to do away with CO2.

Which of the following would be most useful to evaluate the above argument?

A. What is the amount of wind energy resources available in rest of the states in the United States?
B. Are there any other renewable energy resources such as solar power, which can be used?
C. With the use of current technologies, what proportion of electricity generated through wind energy can be stored for use at future times when wind may not be blowing?
D. Are there strong corporate lobbies which will strongly oppose any move to substitute non-renewable sources of energy?
E. What proportion of wind energy is available only at inaccessible areas?

-Chiranjeev Singh


The question stems talks about the US achieving a zero CO2 economy in the next 30 to 50 years. Wind energy seems to be a viable source of alternative energy and that it is extremely likely that the US will be able to do away with CO2. The assumption behind this argument is that the demand for the use of energy would not have exceeded the current amount of energy that wind can generate in the next 30 years. Who knows? There may be some other assumptions that I have not considered. But at least I understand the prompt and the right answer is likely to jump at me.

A. What is the amount of wind energy resources available in rest of the states in the United States?
Well, we already the amount of wind energy that is available. The question is how viable is the current wind energy that we have even discovered? Can we use it? This option is irrelevant.

B. Are there any other renewable energy resources such as solar power, which can be used?
We have not finished using wind energy. So this opion has nothing to do with the argument since we already know that wind energy is enough to meet with our needs. Why look to the sun?

C. With the use of current technologies, what proportion of electricity generated through wind energy can be stored for use at future times when wind may not be blowing?
This options looks popular but I disagree with it. We are talking about achieving zero CO2 economy in 30 years or so. What has current technology got to do with it? I-phone 5 will be an obsolete technology in 3 years time, not to talk of 30.

D. Are there strong corporate lobbies which will strongly oppose any move to substitute non-renewable sources of energy?
Quite trickish. Not all lobbies are successful. Popular demand can throw lobbies into a tailspin. But we need to do the acid test. If we answer yes to the question, it looks as if the argument may no longer hold. What if we answer no? Makes no difference; it doesn't make the argument stronger in any way. We still need to know if we can even use the wind.

E. What proportion of wind energy is available only at inaccessible areas?
There you go! If the proportion of the wind that is available in inaccessible area is very , low, say 5%, then that means 95% of the wind is available for use. What if only 1% of the wind is accessible for use and the remaining 99% is 100,000 feet above sea level? That means all the wind energy discovered is not even available.

I am 95% sure the answer is E.
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New post 02 Sep 2013, 19:34
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New post 03 Sep 2013, 18:50
I think E fits the bill. C is close, but it talks about availability of technology at present. The argument is about something to be happening in next 20 -30 years.
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New post 04 Sep 2013, 01:31
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Re: A zero-CO2 U.S. economy can be achieved within the next thirty to fift  [#permalink]

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New post 04 Sep 2013, 02:19
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egmat wrote:
Hello Everyone,

I'll be posting the OA tonight.

Just a teaser right now :) - Only a couple of guys on this thread have selected the correct choice.

Thanks,
Chiranjeev



The answer is clearly E


C. With the use of current technologies, what proportion of electricity generated through wind energy can be stored for use at future times when wind may not be blowing?
D. Are there strong corporate lobbies which will strongly oppose any move to substitute non-renewable sources of energy?
E. What proportion of wind energy is available only at inaccessible areas?


In ques E if it's assumed that 100% of wind energy is located at inaccessible areas clearly this will weaken the argument.If it's assumed that 0% of wind energy is located at inaccessible areas the argument would be strengthened.Hence E

Problem C talks about the future possibility of wind energy not being available.The argument does not talk about this situation .Hence this is out of scope.



Kudos if you find this explanation useful ;)
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New post 04 Sep 2013, 10:11
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New post 05 Sep 2013, 10:31
egmat wrote:
OA has been posted. It is option E. People in this thread who chose option E have given correct explanations for the same.

Let me know if anyone still has doubts :)

Thanks,
Chiranjeev


Can we discuss why C is not the correct answer. I want to discuss so that I can have more clear thought process.

Regards,
Himanshu
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Re: A zero-CO2 U.S. economy can be achieved within the next thirty to fift  [#permalink]

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New post 15 Oct 2013, 13:47
egmat wrote:
heman2727 wrote:
egmat wrote:
OA has been posted. It is option E. People in this thread who chose option E have given correct explanations for the same.

Let me know if anyone still has doubts :)

Thanks,
Chiranjeev


Can we discuss why C is not the correct answer. I want to discuss so that I can have more clear thought process.

Regards,
Himanshu

Hi Himanshu,

Good that you brought this up. A lot of students marked choice C.

C. With the use of current technologies, what proportion of electricity generated through wind energy can be stored for use at future times when wind may not be blowing?

So, option C asks what proportion of electricity can be stored?

Now, tell me what proportion do we want?

The answer is: We don't know.

Nowhere the passage talks about the times in which wind is not blowing. If the passage had said. let's say, that the wind does not blow for one month every year, then in that case, we would have wanted to store 1/11th of the electricity. In that case, it might have made sense to know how much electricity we can store.

But the given passage does not talk about a scenario in which the wind does not blow. Rather, we don't even know if there is a period in which doesn't blow. Probably, the wind blows all the time. We don't know. In such a scenario, option C does not help us evaluate the argument.

On the other hand, option E is extremely relevant to the argument. We require 40% of wind energy. Right? How much can we access? Less than or more than 40%? This is what option E asks.

Frankly, option C was specially crafted with a lot of relevant and common sense words to confuse students :wink: and placed before the correct choice so that when students read the correct choice, they read it with a bias against the correct choice (because in their mind, they have already found the correct choice) :wink:

Thanks,
Chiranjeev


Dear E-Gmat,

I see the same behavior of GMAC to put the wrong answer choice just before or slighty above the OA again & again.
Are there any particular tricks or technics that will help us avoid these traps?

THX!
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New post 16 Oct 2013, 08:57
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lucbesson wrote:
Dear E-Gmat,

I see the same behavior of GMAC to put the wrong answer choice just before or slighty above the OA again & again.
Are there any particular tricks or technics that will help us avoid these traps?

THX!


Hi,

I think given that there are five choices in a GMAT question and if each has equal probability of being the correct choice, then in 80% of the cases, a wrong choice will appear before the correct choice. Some of these wrong choices will be trickier also. So, I don't see any unexpected pattern here.

Besides, we don't really focus on tricks at eGMAT. Rather, I will caution you against depending on any tricks. I believe that the logical part of your brain should be calling all the shots when you sit for GMAT. If you keep worrying about the set of tricks you learnt, then that would only hamper the free functioning of the logical brain and would negatively impact your score. Just sharing my honest opinion with you.

Thanks,
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New post 01 Aug 2017, 21:48
A zero-CO2 U.S. economy can be achieved within the next thirty to fifty years without the use of nuclear power. The U.S. renewable energy resource base is vast and practically untapped. Available wind energy resources in 12 Midwestern and Rocky Mountain states equal about 2.5 times the entire electricity production of the United States. Given that we can satisfy our electricity needs by harnessing only 40% of the wind energy resources in these 12 states, it is extremely likely that we will be able to do away with CO2.

The entire argument boils down to the fact that only 40% of the wind energy resources would be required to satisfy the electricity needs of the country => It's likely we will be able to do away with the CO2.
Quote:
The only way this master plan would NOT work is if the wind energy is in inaccessible areas -> This is what I thought as soon as I read the argument.



Which of the following would be most useful to evaluate the above argument?
Quote:
A. What is the amount of wind energy resources available in rest of the states in the United States?
Argument already states that the 12 states have 2.5 times the entire electricity production of the US. SO this is irrelevant. OUT!


Quote:
B. Are there any other renewable energy resources such as solar power, which can be used?

We are only concerned with Wind Energy. OUT!


Quote:
C. With the use of current technologies, what proportion of electricity generated through wind energy can be stored for use at future times when wind may not be blowing?

Current Tech isn't a part of this discussion. Plus, I really don't think the proportion of electricity that can be stored has anything to do with the author's claim that we can do away with CO2


Quote:
D. Are there strong corporate lobbies which will strongly oppose any move to substitute non-renewable sources of energy?

This was a close second for me. Even if they do strongly oppose, they might not be able to win the bill, or it's equivalent, so this options leaves a lot to be desired. Good try but OUT!


Quote:
E. What proportion of wind energy is available only at inaccessible areas?

If majority of the wind energy is ONLY available at inaccessible areas then we will not be able to do away with CO2.
This is the correct answer.
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Re: A zero-CO2 U.S. economy can be achieved within the next thirty to fift  [#permalink]

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New post 02 Aug 2017, 08:43
egmat wrote:
Hi Everyone,

Here's another question from e-GMAT. It is an evaluate question type, which, as experience of recent test takers suggest, is becoming more important on GMAT.

Share your answers with analysis. Looking forward to a healthy discussion :)

A zero-CO2 U.S. economy can be achieved within the next thirty to fifty years without the use of nuclear power. The U.S. renewable energy resource base is vast and practically untapped. Available wind energy resources in 12 Midwestern and Rocky Mountain states equal about 2.5 times the entire electricity production of the United States. Given that we can satisfy our electricity needs by harnessing only 40% of the wind energy resources in these 12 states, it is extremely likely that we will be able to do away with CO2.

Which of the following would be most useful to evaluate the above argument?

A. What is the amount of wind energy resources available in rest of the states in the United States?
B. Are there any other renewable energy resources such as solar power, which can be used?
C. With the use of current technologies, what proportion of electricity generated through wind energy can be stored for use at future times when wind may not be blowing?
D. Are there strong corporate lobbies which will strongly oppose any move to substitute non-renewable sources of energy?
E. What proportion of wind energy is available only at inaccessible areas?

-Chiranjeev Singh


A very good questio from Egamt

The answer is E

To correctly evaluate the conclusion that US will do away with CO2 we need to shown that the wind energy resources available in the said areas are accessible .
If they are not accessible then they can not be harnessed and US will not be able to achieve is commitment .
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New post 07 Aug 2019, 02:34
Initially I was confused between C & E , but ended up choosing C .
Somehow ,I believe that the Ans -E would have been the best choice , had it stated that - How much wind energy availablE in inaccessible areas in MRM staes ( those particular 12 states ) .

I went to tick C because I thought the E option sounded too generic , no where it was mentioned about MRM states . The E option is written in such a manner that I thought it is referring to calculate the percentage of inaccessible sources out of whole lot ( USA ) not just those MRM states ( 12 states)
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Re: A zero-CO2 U.S. economy can be achieved within the next thirty to fift   [#permalink] 07 Aug 2019, 02:34
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