Correct Answer: A
1. Breakdown of the Argument:
Premise: Domestic energy-intensive industries in developed nations reduce their emissions intensity per unit of output under carbon pricing policies.
Premise: However, aggregate national emissions in these developed nations do not always decrease proportionally.
Premise: This is partly due to increased reliance on imported goods and energy from countries with less rigorous environmental regulations and lower carbon prices (carbon leakage).
Premise: Carbon leakage complicates the overall global decarbonization effort, as emissions are displaced rather than eliminated.
Premise: Current data is equivocal regarding the long-term global emissions trajectory, despite proponents' hopes for future mitigation via global regulatory convergence.
Premise: The demand for energy-intensive goods is assumed to be relatively inelastic.
2. Logical Analysis: The core of the passage highlights a discrepancy: while carbon pricing policies lead to reduced emissions *intensity* domestically, this does not necessarily translate to a proportional reduction in *aggregate national* emissions, and crucially, it complicates the *overall global decarbonization effort*. The mechanism for this complication is "carbon leakage," where emissions are "displaced rather than eliminated" by shifting production or supply chains to less regulated countries. Therefore, if domestic emissions intensity is reduced, but this is offset by increased emissions elsewhere due to leakage, then the *net effect* on global emissions will be less than what a simple tally of domestic intensity reductions would suggest. Option (A) directly captures this consequence of carbon leakage: the global impact is initially "less substantial than implied by the reduction in those nations' domestic emissions intensity" because some emissions are merely relocated, not removed from the global total. This must be true given the description of carbon leakage and its effect on global decarbonization.
3. Why the other options are incorrect:
(A): This statement must be true. The passage explicitly states that carbon leakage means emissions are "effectively displaced rather than eliminated," complicating the "overall global decarbonization effort," and that "aggregate national emissions have not always seen a proportional decrease" despite domestic intensity reductions. This directly implies that the *overall global reduction* will be less than what one might expect by only looking at the domestic improvements in intensity.
(B): The passage notes that "global regulatory convergence will eventually mitigate this effect" (carbon leakage). However, it does not state that such uniform and simultaneous adoption is *necessary* for *any* progress or for *all* intended goals. It's presented as a potential solution for mitigation, not an absolute prerequisite for success, making the word "must" too strong and not strictly inferable.
(C): While the passage states there is "increased reliance on imported goods and energy from countries with significantly less rigorous environmental regulations and often, lower carbon prices," implying a cost advantage, it does not state that this constitutes an "undeniable competitive advantage" *overall*. There could be other factors (quality, logistics, labor costs, etc.) that mitigate or complicate this. "Undeniable competitive advantage" is a strong claim that goes beyond the strict information provided.
(D): The stimulus explicitly states, "The underlying assumption, for now, is that demand for energy-intensive goods remains relatively inelastic." This contradicts the assertion in option (D) that demand is "likely to decrease significantly." An inelastic demand means it is not very responsive to price changes, which suggests a significant decrease is *unlikely*, at least based on the current assumption mentioned in the text.