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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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08 Oct 2007, 10:26
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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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08 Oct 2007, 10:31
D ?
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08 Oct 2007, 10:38
D. If Methane gas causes more heat to be trapped in the atmoshpere then Carbon Dioxide, then by turning Methane into Carbon Dioxide will decrease the overall level of gases blocking heat and will increase the amount of heat that can be released into space.
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08 Oct 2007, 10:47
D is to the point that since methane causes more global warming than carbon dioxide, capturing it would be a good measure to reduce overall global warming gasses.
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08 Oct 2007, 10:56
straight D.

We are loooking for something which suggests that either Methane doesn't produce CO2 as a result of burning or that Methan is more harmful than CO2

A. Doesn't counter the objection. OUT
B. Out of scope. OUT
C. If you dont read carefully,it may sound correct but It actually strenghten the objection. OUT
D. It suggest that Methane is more harmful than resultant CO2 so CORRECT.
E. Again out of scope. It actually introduce another argument. OUT.
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08 Oct 2007, 11:17
D.

Well, as per Proposal:

Both Carbon dioxide and Methane are Green House gases and block the escape of heat into space.
Also, proposal emphasize upon the control of the emission of Methane.

As per Objection:

The burning of methane generates carbon dioxide that is released into the atmosphere. And CO2 is also one of the Green House Gases.
It means if we control the emission of CH4 by burning it then the process will liberate CO2.

We can counter this objection by an arguement that CH4 is more dangerous than CO2. Even though we are getting CO2 as the by product of burning CH4, liberation of CO2 will be less dangerous than expulsion of CH4.

Only D counters the objection by stating that Methane in the atmosphere is more effective in blocking the escape of heat and hence is more dangerous than CO2.

E is a trap. It is actually giving a suggestion as to how we can control CH4 but is not counteracting the Objection.

- Brajesh
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08 Oct 2007, 19:33
no doubt here
OA=D
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08 Oct 2007, 20:29
bkk145 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.

A: Irrelevant.
B: Still doesn't weaken the objection. Nothing is said about distance and methane and the effects.
C: This would weaken the argument not the objection.
E: irrelevant we are trying to weaken the objection that converting methane to electricity is bad.

D: only D weakens the objection.
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Re: Proposal: Carbon dioxide and methane in the atmosphere block [#permalink]

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30 Jun 2014, 01:26
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] 30 Jun 2014, 01:26
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