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Proposal: Carbon dioxide and methane in the atmosphere block

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Senior Manager
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Proposal: Carbon dioxide and methane in the atmosphere block [#permalink] 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: CR: carbon Dioxide [#permalink] New post 03 Aug 2008, 12:34
D

assuming that 1 methane molecule gives 1 co2 molecule when burnt
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Re: CR: carbon Dioxide [#permalink] 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: CR: carbon Dioxide [#permalink] New post 04 Aug 2008, 10:52
Why can't it be C?
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Re: CR: carbon Dioxide [#permalink] New post 04 Aug 2008, 11:48
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] New post 20 Sep 2014, 22:31
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
Re: Proposal: Carbon dioxide and methane in the atmosphere block   [#permalink] 20 Sep 2014, 22:31
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