Nature constantly adjusts the atmospheric carbon level. An : GMAT Critical Reasoning (CR)
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# Nature constantly adjusts the atmospheric carbon level. An

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VP
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11 Sep 2004, 18:50
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Nature constantly adjusts the atmospheric carbon level.
An increase in the level causes the atmosphere to hold more heat, which causes more water to evaporate from the oceans, which causes increased rain. Rain washes some carbon from the air into the oceans, where it eventually becomes part of the seabed.
A decrease in atmosphere carbon causes decreased evaporation from the oceans, which cause less rain, and thus less carbon is washed into the oceans.
Yet some environmentalists worry that burning fossil fuels may raise atmospheric carbon to a dangerous level. It is true that a sustained increase would threaten human life. But the environmentalists should relax---nature will continually adjust the carbon level.

Which one of the following, if true, would most weaken the argument in the passage?

(A) Plant life cannot survive without atmospheric carbon.

(B) It is not clear that breathing excess carbon in the atmosphere will have a negative effect on human life.

(C) Carbon is part of the chemical â€œblanketâ€
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11 Sep 2004, 20:42
Conclision is that:
Nature will take care of the carbon levels

Evidence is that:
Carbon levels are depleted and replenished by the laws of evaporations and condensation.

Assumption is that:
There is no external inflluence other than pure natural causes.

E states that the natural adjustment process takes millions of years to adjust the level of carbon, so this weakens the argument

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11 Sep 2004, 21:25
I get E

If E is true then even though nature continually adjusts the carbon level, the lead time is too long and sustained increase in carbon would threaten human life in short term
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12 Sep 2004, 00:55
only E makes most sense. Provides the critical info that the carbon correction is not a daily happening.
12 Sep 2004, 00:55
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