Climate models uncertainty and decisions – UGC NET Question

Statements A, C, D and F are correct because models use scenarios to simulate future climates, uncertainty has multiple sources, scenario outputs can still guide risk management, and ensembles provide ranges instead of a single number. Statement B is false since different models often produce different regional projections due to structural differences. Statement E is also false because uncertainty is a reason to manage risk more carefully, not to ignore climate impacts in decisions. Hence, the combination containing A, C, D and F only is correct.

Option A:
Option A is incorrect as it omits F and thus ignores the role of ensemble projections in dealing with uncertainty. Without F, the approach to characterising ranges of outcomes is incomplete.

Option B:
Option B is correct because it lists all the true statements and excludes B and E, which mistakenly assume identical outputs or deny the usefulness of projections for decision-making.

Option C:
Option C is incorrect since it includes E, which suggests that uncertain information cannot be used in decisions, contradicting risk management principles. It also omits A, so it fails to mention what climate models actually do.

Option D:
Option D is incorrect because it includes B, which wrongly claims all models give identical rainfall projections, even though structural differences lead to varying regional outcomes.