Climate Evaluation

Mutation ReasoningThe new claim is identical in substance to the 2019 historical stance: both state that five CTG-operated reservoirs with a combined flood-control capacity of 28.7 billion cubic meters are included in the joint flood-control operation on the upper and middle reaches of the Yangtze River. The contextual detail about 'accounting for 70% of the total capacity' in the historical stance is additional but not contradictory or modifying — it's supplementary information not present in the new claim, but its absence does not constitute a mutation (e.g., no scope reduction, no retraction, no reframing). Since the core factual assertion remains unchanged and no meaningful deviation exists, this is a verbatim restatement — not a drift, dilution, amplification, or contradiction.