Climate sensitivity (Option C) measures the expected increase in global temperatures if atmospheric CO₂ levels double from pre-industrial levels (around 280 ppm).
Higher climate sensitivity means stronger warming effects and greater climate risks.
Option A (Human activity altering CO₂) is more about emissions sources, not climate sensitivity itself.
Option B (Sustainability definition) refers to general environmental principles, not climate sensitivity.
[References:, IPCC Climate Sensitivity Assessment (2021), NASA Global Climate Change Reports, PRI Climate Risk and Portfolio Analysis Guide, , , , , ]
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