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Furthermore, they used climate models to show that the observed warming trend is outside the expected range of natural variability and is therefore probably the result of human influence.
In 2003 in Europe there was a heatwave that was far outside the range of natural variability as we know it.
Since 1980, the global mean temperature has begun to climb well above the likely range of natural variability experienced in the previous 120 years .
Thus, the geological record has become an extremely important archive for understanding the range of natural variability in climate, the processes that cause climate change on decadal and longer time scales, and the background variability from which greenhouse warming must be detected.
The critical concept of SES analysis is a comparison of current ecosystem conditions, at various geographic scales, to the range of natural variability that determined the character of the biotic communities and species native to the area.
They added that the 2001 temperature swings seem to be within the range of natural variability over those decades.
Since 1980, the global mean temperature has begun to climb well above the likely range of natural variability experienced in the previous 120 years.
Pulling the entire case together, Hasselmann and his coworkers estimate a 95 percent chance that the observed climate changes exceed the range of natural variability.