Personally, I think that 10, or 12 years is too short a time for the impact to be measurable. Perhaps five hundred years is required. It caan always be argued that extremes and fluctuations int he weather patterns are just part of an acceptable natural deviation. Having said that, scarcely a month/season/year goes by without it being the wettest/hottest/windiest/somethingelsest since records began. Undoubtedly this is partly because of the relatively short period that records have been kept, but it's also potentially an indicator that patterns are changing.
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