Climate Fluctuation or Climate Change?

The 1930’s United States Dust Bowl is an example of a climate fluctuation. Source: Goddard Space Flight Center | NASA

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A climate fluctuation is a change that can be seen within a smaller scope of time, typically within a 30-year period.

The Glacial and Interglacial periods of the Pleistocene Epoch would be an example of climate change. Source: Earth's Climate History: Implications for Tomorrow | NASA

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A climate change describes variations that remain for extended periods (more than 30 years).