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Zorluk: ZorIdentifying Unstated Assumptions

To meet new regional environmental targets, Apex Airways plans to replace conventional jet fuel across its entire short-haul fleet with synthetic fuel manufactured from captured atmospheric carbon dioxide. The airline's executives claim that implementing this plan will reduce Apex Airways' overall annual net carbon emissions by at least 30 percent over the next two years. They point out that burning synthetic fuel releases only the carbon dioxide previously extracted from the atmosphere during its production. Which of the following is an assumption on which the executives' claim depends?

  1. The electricity used in the synthesis of the new fuel does not generate carbon emissions that offset a substantial portion of the net emissions reduction achieved during flights.Cevap
  2. B
    Synthetic fuel will become less expensive to produce than conventional jet fuel over the next two years.
  3. C
    Apex Airways will significantly expand its total number of daily short-haul flights over the next two years.
  4. D
    All other regional airlines operating competing routes will also transition to synthetic fuel within two years.
  5. E
    The existing engines of Apex Airways' fleet require costly mechanical alterations to run on synthetic fuel.

Cevap

The argument depends on assuming that the electricity used to synthesize the fuel does not generate emissions that negate the expected carbon reduction.
The argument concludes that Apex Airways will achieve a 30 percent net reduction in carbon emissions by switching to synthetic fuel. The premise notes that burning synthetic fuel adds no net carbon because it releases only captured atmospheric carbon. However, if the manufacturing process itself relies on electricity generated from high-emissions sources (such as coal or natural gas), the overall carbon footprint across the lifecycle of the fuel could offset the flight-stage savings. Therefore, the executives must assume that energy used in production does not negate these savings.

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1
Identify the argument's premises and conclusion.
Premise: Synthetic fuel releases only previously captured CO2 when burned. Conclusion: Overall annual net carbon emissions of the airline will drop by at least 30%.
Understanding the precise leap from premise to conclusion highlights logical gaps.
2
Locate the logical gap in the lifecycle of the synthetic fuel.
The argument focuses strictly on the flight phase (combustion) and atmospheric extraction, but overlooks the energy inputs required during the fuel synthesis process.
If producing the fuel requires high-carbon energy, total net emissions could remain unchanged or increase.
3
Apply the Negation Test to the correct option.
Negating the statement yields: 'The electricity used in manufacturing DOES generate emissions that offset a substantial portion of the net emissions reduction.' This completely shatters the conclusion.
A required assumption must cause the conclusion to collapse when logically negated.

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Identifying Unstated Assumptions using the Negation Test
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Identifying Unstated Assumptions

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