Text 1 highlights how high-speed rail lines reduce regional aviation fuel emissions along heavily traveled corridors.
Text 2 underscores the immense upfront carbon emissions and ecological disruption caused by constructing concrete rail tunnels and viaducts.
What comprehensive insight emerges from synthesizing both passages?
Answer and explanation
Correct answer: D. High-speed rail yields net carbon reductions only after sustained operational years offset initial construction debt
- Step 1: Rail reduces ongoing travel emissions (Text 1), but initial construction creates heavy carbon debt (Text 2). Step 2. Synthesis reveals that net emissions savings occur over time as operational displacement offsets construction carbon. Answer: High-speed rail yields net carbon reductions only after sustained operational years offset initial construction debt. Why not the others: Text 2 proves construction is carbon-intensive, and aviation is polluting.
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