Logging industry official: Harvesting trees from old-growth : GMAT Critical Reasoning (CR)
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Logging industry official: Harvesting trees from old-growth

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Logging industry official: Harvesting trees from old-growth [#permalink]

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New post 21 May 2009, 18:47
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Logging industry official: Harvesting trees from old-growth forests for use in manufacture can reduce the amount of carbon dioxide in the atmosphere, since when large old trees die in the forest they decompose, releasing their stored carbon dioxide. Harvesting old-growth forests would, moreover, make room for rapidly growing young trees, which absorb more carbon dioxide from the atmosphere than do trees in old-growth forests.
Which one of the following, if true, most seriously weakens the official’s argument?
(A) Many old-growth forests are the home of thousands of animal species that would be endangered if the forests were to be destroyed.
(B) Much of the organic matter from old-growth trees, unusable as lumber, is made into products that decompose rapidly.
(C) A young tree contains less than half the amount of carbon dioxide that is stored in an old tree of the same species.
(D) Much of the carbon dioxide present in forests is eventually released when wood and other organic debris found on the forest floor decompose.
(E) It can take many years for the trees of a newly planted forest to reach the size of those found in existing old-growth forests.
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Re: Old-growth forests [#permalink]

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New post 21 May 2009, 18:57
IMO B

Logging industry official: Harvesting trees from old-growth forests for use in manufacture can reduce the amount of carbon dioxide in the atmosphere, since when large old trees die in the forest they decompose, releasing their stored carbon dioxide. Harvesting old-growth forests would, moreover, make room for rapidly growing young trees, which absorb more carbon dioxide from the atmosphere than do trees in old-growth forests.
Which one of the following, if true, most seriously weakens the official’s argument?
(A) Many old-growth forests are the home of thousands of animal species that would be endangered if the forests were to be destroyed -->animal species endangered are out of scope
(B) Much of the organic matter from old-growth trees, unusable as lumber, is made into products that decompose rapidly -->the best: it weakens the argument that manufacturing from material of old grown trees can reduce the release of carbon dioxide. Nevertheless, organic matter from old growth trees, when made into products, decomposes rapidly and thereby, releasing carbon dioxide
(C) A young tree contains less than half the amount of carbon dioxide that is stored in an old tree of the same species -->counter fact
(D) Much of the carbon dioxide present in forests is eventually released when wood and other organic debris found on the forest floor decompose -->too general
(E) It can take many years for the trees of a newly planted forest to reach the size of those found in existing old-growth forests -->irrelevant
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Re: Old-growth forests [#permalink]

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New post 21 May 2009, 20:03
I'll go with C

The stem says that " harvesting trees from old growth forests will reduce the amount of CO2 in the atmosphere" and the reasoning is - "the young trees will have more capacity to absorb CO2 than do the old trees"

C counters the above fact by saying that " the young trees have less than half of the amount of CO2 that old trees have"

Hence C weakens the argument

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Re: Old-growth forests [#permalink]

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New post 22 May 2009, 04:06
I will aldo go For C. B and D lures us by contadicting the evidence but C attacks the conclusion.
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Re: Old-growth forests [#permalink]

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New post 22 May 2009, 04:24
tkarthi4u wrote:
I will aldo go For C. B and D lures us by contadicting the evidence but C attacks the conclusion.

The argument here is: Harvesting trees from old-growth forests for use in manufacture can reduce the amount of carbon dioxide in the atmosphere

The final sentence is just another premise helps to reach to the argument: Harvesting old-growth forests would, moreover, make room for rapidly growing young trees, which absorb more carbon dioxide from the atmosphere than do trees in old-growth forests --> help to emphasize the argument that Harvesting trees from old-growth forests for use in manufacture can reduce the amount of carbon dioxide in the atmosphere
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Re: Old-growth forests [#permalink]

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New post 22 May 2009, 07:04
I agree with B on this.

It directly counter the conclusion by saying that the products of that manufacturing process decompose rapidly (and hence releasing CO2) so harvesting the trees for manufacturing is not a good idea.
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Re: Old-growth forests [#permalink]

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New post 23 May 2009, 02:49
Re: Old-growth forests   [#permalink] 23 May 2009, 02:49
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