During the annual Town Hall meeting, the mayor reported that since the introduction of a new recycling program, the town has seen a significant increase in the amount of waste being recycled. Consequently, the mayor claimed that the new recycling program must be the reason for the increased recycling rates. However, some residents pointed out that last year's extreme weather conditions, which reduced waste production, might have also contributed to the increase in recycling rates.
Based on the mayor's argument, which of the following identifies a flaw in the reasoning?