Proposal: Carbon dioxide and methane in the atmosphere block : GMAT Critical Reasoning (CR)
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Proposal: Carbon dioxide and methane in the atmosphere block

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Proposal: Carbon dioxide and methane in the atmosphere block [#permalink]

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New post 03 Aug 2008, 11:24
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Proposal: Carbon dioxide and methane in the atmosphere block the escape of heat into space. So emission of these “greenhouse” gases contributes to global warming. In order to reduce global warming, emission of greenhouse gases needs to be reduced. Therefore, the methane now emitted from open landfills should instead be burned to produce electricity.
Objection: The burning of methane generates carbon dioxide that is released into the atmosphere.

Which of the following, if true, most adequately counters the objection made to the proposal?

A. Every time a human being or other mammal exhales, there is some carbon dioxide released into the air.
B. The conversion of methane to electricity would occur at a considerable distance from the landfills.
C. The methane that is used to generate electricity would generally be used as a substitute for a fuel that does not produce any greenhouse gases when burned.
D. Methane in the atmosphere is more effective in blocking the escape of heat from the Earth than is carbon dioxide.
E. The amount of methane emitted from the landfills could be reduced if the materials whose decomposition produces methane were not discarded, but recycled.
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Re: Proposal: Carbon dioxide and methane in the atmosphere block [#permalink]

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New post 03 Aug 2008, 12:34
D

assuming that 1 methane molecule gives 1 co2 molecule when burnt
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Re: Proposal: Carbon dioxide and methane in the atmosphere block [#permalink]

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New post 04 Aug 2008, 00:14
x97agarwal wrote:
Proposal: Carbon dioxide and methane in the atmosphere block the escape of heat into space. So emission of these “greenhouse” gases contributes to global warming. In order to reduce global warming, emission of greenhouse gases needs to be reduced. Therefore, the methane now emitted from open landfills should instead be burned to produce electricity.
Objection: The burning of methane generates carbon dioxide that is released into the atmosphere.

Which of the following, if true, most adequately counters the objection made to the proposal?

A. Every time a human being or other mammal exhales, there is some carbon dioxide released into the air.
B. The conversion of methane to electricity would occur at a considerable distance from the landfills.
C. The methane that is used to generate electricity would generally be used as a substitute for a fuel that does not produce any greenhouse gases when burned.
D. Methane in the atmosphere is more effective in blocking the escape of heat from the Earth than is carbon dioxide.
E. The amount of methane emitted from the landfills could be reduced if the materials whose decomposition produces methane were not discarded, but recycled.


IMO D)
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Re: Proposal: Carbon dioxide and methane in the atmosphere block [#permalink]

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New post 04 Aug 2008, 10:52
Why can't it be C?
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Re: Proposal: Carbon dioxide and methane in the atmosphere block [#permalink]

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x97agarwal wrote:
Proposal: Carbon dioxide and methane in the atmosphere block the escape of heat into space. So emission of these “greenhouse” gases contributes to global warming. In order to reduce global warming, emission of greenhouse gases needs to be reduced. Therefore, the methane now emitted from open landfills should instead be burned to produce electricity.
Objection: The burning of methane generates carbon dioxide that is released into the atmosphere.

Which of the following, if true, most adequately counters the objection made to the proposal?

A. Every time a human being or other mammal exhales, there is some carbon dioxide released into the air. -> irrelevant
B. The conversion of methane to electricity would occur at a considerable distance from the landfills. -> irelevant
C. The methane that is used to generate electricity would generally be used as a substitute for a fuel that does not produce any greenhouse gases when burned. -> this strengthens the objection saying methane should not be burnt
D. Methane in the atmosphere is more effective in blocking the escape of heat from the Earth than is carbon dioxide. -> this counters most effectively saying that CO2 is less effective than methane in releasing greenhouse gases
E. The amount of methane emitted from the landfills could be reduced if the materials whose decomposition produces methane were not discarded, but recycled. -> irrelevant

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Re: Proposal: Carbon dioxide and methane in the atmosphere block [#permalink]

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New post 20 Sep 2014, 22:31
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Re: Proposal: Carbon dioxide and methane in the atmosphere block [#permalink]

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New post 26 Apr 2016, 11:46
Here we are trying to establish a comparison between CO2 and CH4..

Since we need to weaken the objection,which says CH4 produces CO2 hence should not be burned.

If it is established that Co2 is better in any sense, it will weaken.

Hence Answer D
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Proposal: Carbon dioxide and methane in the atmosphere block [#permalink]

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New post 27 Apr 2016, 03:17
spriya wrote:
x97agarwal wrote:
Proposal: Carbon dioxide and methane in the atmosphere block the escape of heat into space. So emission of these “greenhouse” gases contributes to global warming. In order to reduce global warming, emission of greenhouse gases needs to be reduced. Therefore, the methane now emitted from open landfills should instead be burned to produce electricity.
Objection: The burning of methane generates carbon dioxide that is released into the atmosphere.

Which of the following, if true, most adequately counters the objection made to the proposal?

A. Every time a human being or other mammal exhales, there is some carbon dioxide released into the air. -> irrelevant
B. The conversion of methane to electricity would occur at a considerable distance from the landfills. -> irelevant
C. The methane that is used to generate electricity would generally be used as a substitute for a fuel that does not produce any greenhouse gases when burned. -> this strengthens the objection saying methane should not be burnt
D. Methane in the atmosphere is more effective in blocking the escape of heat from the Earth than is carbon dioxide. -> this counters most effectively saying that CO2 is less effective than methane in releasing greenhouse gases
E. The amount of methane emitted from the landfills could be reduced if the materials whose decomposition produces methane were not discarded, but recycled. -> irrelevant

spriya
How is C strengthening ?
Greenhouse gases = methane + co2
Objection- Burning methane produces co2

C says methane will be used as a substitute that will not produce co2

Isn't c weakNING CLEARLY ?

I came down to C and D, chose C

TIA
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Re: Proposal: Carbon dioxide and methane in the atmosphere block [#permalink]

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New post 18 Jun 2016, 08:54
C. The methane that is used to generate electricity would generally be used as a substitute for a fuel that does not produce any greenhouse gases when burned.

Methane replaces a fuel that doesnt generate green house gases but it's not mentioned that methane also doesnt produce green house gases in this process. So it can still produce gases.
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Re: Proposal: Carbon dioxide and methane in the atmosphere block [#permalink]

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New post 19 Jun 2016, 00:08
bigfernhead wrote:
Why can't it be C?


Because C does the opposite of refuting the objection! :-D
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Re: Proposal: Carbon dioxide and methane in the atmosphere block [#permalink]

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New post 24 Jun 2016, 04:57
Proposal: Carbon dioxide and methane in the atmosphere block the escape of heat into space. So emission of these “greenhouse” gases contributes to global warming. In order to reduce global warming, emission of greenhouse gases needs to be reduced. Therefore, the methane now emitted from open landfills should instead be burned to produce electricity.
Objection: The burning of methane generates carbon dioxide that is released into the atmosphere.

Which of the following, if true, most adequately counters the objection made to the proposal?

A. Every time a human being or other mammal exhales, there is some carbon dioxide released into the air.
-- Out of scope
B. The conversion of methane to electricity would occur at a considerable distance from the landfills.
-- Does not provide answer why methane should not be burnt

C. The methane that is used to generate electricity would generally be used as a substitute for a fuel that does not produce any greenhouse gases when burned.
-- will not cause any impact on change in amount of greenhouse gas in atmosphere. Anyways methane is used

D. Methane in the atmosphere is more effective in blocking the escape of heat from the Earth than is carbon dioxide.
-- This provide the reason to counter the objection.

E. The amount of methane emitted from the landfills could be reduced if the materials whose decomposition produces methane were not discarded, but recycled.
-- Out of scope
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Re: Proposal: Carbon dioxide and methane in the atmosphere block [#permalink]

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New post 24 Jun 2016, 06:34
a bit tricky question

most od us would have 2 contenders here C and D

C- counters the proposal
D-counter the objection

we need the latter for the correct answer.

hope it helps
Re: Proposal: Carbon dioxide and methane in the atmosphere block   [#permalink] 24 Jun 2016, 06:34
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