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# Since pollution-causing human activities can cause an

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Manager
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Since pollution-causing human activities can cause an [#permalink]

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14 Aug 2011, 07:48
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Since pollution-causing human activities can cause an increase in average global temperatures, the mild winters in the area could be a result of the high concentration of vehicle exhaust emitted in the region. However, some scientists argue that the mild winters are a result of the increased rate of conversion of commercial areas to industrial areas.

Which of the following, if true, strengthens the scientists' argument?

A) Although commercial property areas tend to emit significantly less pollution than industrial areas, they still emit more than the vehicles in the area on a given day.
B) Most of the people who work in commercial areas drive to work each day.
C) New strict laws in the area require buildings in the industrial areas to reduce their emissions by 60% in the next 5 years.
D) Vehicle exhaust is comprised largely of carbon monoxide, the same pollutant emitted by the industrial areas.
E) In response to consumer demand, exhaust levels per vehicle have steadily decreased in recent years.
[Reveal] Spoiler: OA

Last edited by fluke on 30 Aug 2011, 14:14, edited 1 time in total.
Added the OA per bschool83's suggestion
If you have any questions
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Re: CR - 700 level - global temperature [#permalink]

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14 Aug 2011, 07:56
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bschool83 wrote:
Since pollution-causing human activities can cause an increase in average global temperatures, the mild winters in the area could be a result of the high concentration of vehicle exhaust emitted in the region. However, some scientists argue that the mild winters are a result of the increased rate of conversion of commercial areas to industrial areas.

Which of the following, if true, strengthens the scientists' argument?

Although commercial property areas tend to emit significantly less pollution than industrial areas, they still emit more than the vehicles in the area on a given day.
Most of the people who work in commercial areas drive to work each day.
New strict laws in the area require buildings in the industrial areas to reduce their emissions by 60% in the next 5 years.
Vehicle exhaust is comprised largely of carbon monoxide, the same pollutant emitted by the industrial areas.
In response to consumer demand, exhaust levels per vehicle have steadily decreased in recent years.

I will go with A here.

Scientists' Argument: Mild temperatures were caused by replacement of commercial areas with industrial areas

According to A,

Vehicle pollution < Commercial Pollution < Industrial Pollution =>

From scientists' argument, Industrial activity is increasing. Hence the industrial pollution has a greater effect on the temperature.

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Re: CR - 700 level - global temperature [#permalink]

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21 Aug 2011, 07:41
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hm, between A and E ))
but A seems better , because of these words-

Although commercial property areas tend to emit significantly less pollution than industrial areas, they still emit more than the vehicles in the area on a given day. this means that

imho, the main problem of the answer choice E is that it doesnt show us the difference between vehicle pollution rate and commercial pollution rate.
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Re: CR - 700 level - global temperature [#permalink]

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14 Aug 2011, 10:12
I think E is the answer.

Conclusion: Commercials, rather than vehicle emission, is the culprit behind the recent mild winter.
A. Although commercial property areas tend to emit significantly less pollution than industrial areas, they still emit more than the vehicles in the area on a given day.
=> commercial have more influence on the changing weather pattern but both commercials and vehicle emission may cause the mild winter so A weakens the argument somehow :D
B.Most of the people who work in commercial areas drive to work each day. => cannot conclude commercials support the arg (if any, it even weaken the arg since more cars ,more emission)
C.New strict laws in the area require buildings in the industrial areas to reduce their emissions by 60% in the next 5 years. the winter is now not in 5 years
D. Vehicle exhaust is comprised largely of carbon monoxide, the same pollutant emitted by the industrial areas.not strengthen
E. In response to consumer demand, exhaust levels per vehicle have steadily decreased in recent years. the correct answer. exhaust levels decrease so it may deny the possibility of alternative cause and hence support the main cause (commercials)
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Re: CR - 700 level - global temperature [#permalink]

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20 Aug 2011, 23:35
A

The researchers compare commercial and industrial areas, A is the only answer that features both of them (and compares the pollution level as well)
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Re: CR - 700 level - global temperature [#permalink]

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20 Aug 2011, 23:53
i would go with A
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Re: CR - 700 level - global temperature [#permalink]

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21 Aug 2011, 09:17
i think its A
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Re: CR - 700 level - global temperature [#permalink]

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21 Aug 2011, 23:03
I will go with A here..whtz d OA?
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Re: CR - 700 level - global temperature [#permalink]

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22 Aug 2011, 00:43
I will go with E.

Here the need is to strengthen scientists' argu,who believe that more the industrial area and less commercial more will be the pollution as vehicles have already lessen the exhaust levels the culprit has to be the industrial area
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Re: CR - 700 level - global temperature [#permalink]

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22 Aug 2011, 06:30
here we need to find something that confirm and strenghtens the conclusion. an high rate..........

A for sure
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Re: CR - 700 level - global temperature [#permalink]

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22 Aug 2011, 20:23
+1 E.
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Re: CR - 700 level - global temperature [#permalink]

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24 Aug 2011, 10:40
+1 for A
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Re: CR - 700 level - global temperature [#permalink]

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24 Aug 2011, 10:40
what is the OA
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Re: CR - 700 level - global temperature [#permalink]

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25 Aug 2011, 16:35
yup.......OA ??'
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Re: CR - 700 level - global temperature [#permalink]

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25 Aug 2011, 17:37
A from my side.

bschool83 - whats OA?
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Re: CR - 700 level - global temperature [#permalink]

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28 Aug 2011, 05:58
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Re: CR - 700 level - global temperature [#permalink]

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28 Aug 2011, 07:18
bschool83 wrote:
Since pollution-causing human activities can cause an increase in average global temperatures, the mild winters in the area could be a result of the high concentration of vehicle exhaust emitted in the region. However, some scientists argue that the mild winters are a result of the increased rate of conversion of commercial areas to industrial areas.

Which of the following, if true, strengthens the scientists' argument?

A) Although commercial property areas tend to emit significantly less pollution than industrial areas, they still emit more than the vehicles in the area on a given day.
B) Most of the people who work in commercial areas drive to work each day.
C) New strict laws in the area require buildings in the industrial areas to reduce their emissions by 60% in the next 5 years.
D) Vehicle exhaust is comprised largely of carbon monoxide, the same pollutant emitted by the industrial areas.
E) In response to consumer demand, exhaust levels per vehicle have steadily decreased in recent years.

bschool83:
I couldn't find this question in 1000 series. Could you please post the OA?

Or anyone who has seen this question before, could you please post the correct source of the question and OA.

IMO:
Ans: "A"

As nicely explained by Crick:
Pollution by Vehicles < Pollution by Commercial < Pollution by industrial areas.

If we assume Pollution by Vehicles to be constant,
Pollution by Vehicles + Pollution by Commercial < Pollution by Vehicles + Pollution by Industrial Areas

However, if we grade these components as:
Pollution by Vehicles in Commercial Area=100
Pollution by Commercial Area=200
Pollution by Vehicles in Industrial Area=0
Pollution by Industrial Area=250

The above expression fails. So, it all depends on the comparison between inflow of the vehicles between those two areas.

"E" gives a fact that's tempting but it is not good enough for comparison. What if the industries are not emitting pollution at all and the vehicles, despite lowered vehicular exhaust, is contributing to the pollution.

"D" can be ruled out because the volume of gas emitted is not shown. Both emits CO, agree, but what if industries are emitting 1 tonne of CO and the vehicles are emitting 10 tonnes of CO. Moreover, we don't even know what gases are actually in question. It may very well be SO2 that's the prime measuring factor for pollution.

Give and take, A sounds the best because changing a commercial area to an industrial area won't significantly change the number of vehicles in the area or the gas emitted by those vehicles.
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Re: CR - 700 level - global temperature [#permalink]

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30 Aug 2011, 14:06
A) Although commercial property areas tend to emit significantly less pollution than industrial areas, they still emit more than the vehicles in the area on a given day. STRENGTHEN
B) Most of the people who work in commercial areas drive to work each day. WEAKEN
C) New strict laws in the area require buildings in the industrial areas to reduce their emissions by 60% in the next 5 years. IRRELEVANT
D) Vehicle exhaust is comprised largely of carbon monoxide, the same pollutant emitted by the industrial areas. OUT OF SCOPE
E) In response to consumer demand, exhaust levels per vehicle have steadily decreased in recent years. OUT OF SCOPE
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Re: CR - 700 level - global temperature [#permalink]

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08 Sep 2011, 07:26
+1 for A
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Re: CR - 700 level - global temperature [#permalink]

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08 Sep 2011, 09:27
+1 forA..Although D tempted me..But as 'fluke' as put, it does not show the amount of pollutants emitted by either group..
Re: CR - 700 level - global temperature   [#permalink] 08 Sep 2011, 09:27

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