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Zorluk: OrtaIdentifying Necessary Assumptions

City official: We are planning to replace our current fleet of diesel public buses with electric buses to reduce the city's overall carbon footprint. Although manufacturing electric buses generates more carbon emissions than manufacturing diesel buses, electric buses produce zero emissions while operating. Therefore, completing this fleet replacement will successfully reduce our overall carbon footprint.

Which of the following statements are necessary assumptions required by the city official's argument? Select all that apply.

  1. The electric buses will remain in operation long enough for the emissions saved by their use to exceed the additional carbon emissions produced during their manufacturing.Cevap
  2. The methods used to generate the electricity powering the new buses will not produce carbon emissions that offset the operational emission savings.Cevap
  3. C
    The city's current fleet of diesel public buses is the single largest contributor to the city's overall carbon footprint.
  4. D
    Replacing the diesel buses with electric buses is the most cost-effective strategy for the city to achieve its environmental goals.
  5. E
    The electric buses will completely eliminate the need for any maintenance vehicles that rely on diesel fuel.

Cevap

The correct necessary assumptions are that the electric buses will operate long enough to offset their manufacturing emissions, and that the electricity source will not produce emissions that negate the operational savings.
The argument concludes that the fleet replacement will successfully reduce the city's overall carbon footprint, despite the higher manufacturing emissions of the electric buses. For this to be mathematically and logically true, two realities must hold: the operational savings must eventually surpass the initial manufacturing deficit, and the energy source powering the buses must not introduce massive new emissions that cancel out the operational benefits. If either of these statements is false, the carbon footprint would increase or stay the same, utterly destroying the conclusion.

Adım Adım Çözüm

1
Identify the argument's core components: the premises and the conclusion.
Premise: Electric buses have zero operational emissions but higher manufacturing emissions than diesel buses. Conclusion: The fleet replacement will successfully reduce the overall carbon footprint.
Understanding the exact boundaries of the argument is essential to finding the logical gaps between the provided evidence and the conclusion.
2
Locate the conceptual gaps in the reasoning.
Gap 1: The time required in service to offset the higher manufacturing emissions is never stated. Gap 2: The emissions originating from the electricity used to run the 'zero-emission' buses are ignored.
Necessary assumptions always bridge a conceptual gap between the premises provided and the conclusion drawn by the author.
3
Apply the Negation Technique to the strongest potential answers.
Negating the correct statements causes the argument to collapse entirely: if the buses don't last long enough to offset manufacturing, or if the power grid relies on high-emission sources, the total carbon footprint will not decrease.
A strictly necessary assumption is one that, if proven false, actively destroys the argument's conclusion.

Anahtar Kavram

Identifying Necessary Assumptions using the Negation Technique
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Identifying Necessary Assumptions

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