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Story summary
- U.S. rodentologist Dr Robert Corrigan warns repeat warm winters boost rat reproduction, expanding city populations.
- His 2025 study of 16 cities linked rising temperatures to dramatic rat number surges.
- Alberta’s pest program cut yearly rat infestations to five in 2025, down from 600 after WWII.
- Alberta specialist Karen Wickerson warns an unusually warm autumn in 2026 could erode the province’s cold-climate advantage.
