A corporate logistics firm plans to reduce carbon emissions by replacing its fleet of diesel trucks with electric vehicles. Management argues that because the local electricity grid is powered primarily by zero-emission hydroelectric dams, this fleet transition will eliminate the company's net greenhouse gas emissions from freight transportation. Evaluate whether the following claim is a necessary unstated assumption of the management's argument: The total lifecycle emissions generated during the manufacturing and disposal of the electric vehicle fleet will not exceed the operational emissions produced by the existing diesel fleet over the same period.
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True. The claim represents a necessary unstated assumption required for the argument's conclusion to hold.
The author concludes that replacing diesel trucks with electric vehicles will eliminate net greenhouse gas emissions from freight transportation, relying solely on the premise that the electricity used during operation comes from zero-emission hydroelectric dams. For the total net emissions to be eliminated, non-operational sources of emissions associated with the new fleet—specifically manufacturing and disposal—must not outweigh the operational emissions saved by abandoning diesel. Negating the statement establishes that manufacturing and disposal emissions would exceed diesel operational emissions, which directly contradicts the claim that net emissions will be eliminated. Therefore, the argument depends on this unstated assumption.
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Identifying Unstated Assumptions via the Negation Test