The maps show that the world has been getting warmer since the Industrial revolution, although it doesn’t show why this is the case. This is how NASA explains their map: “The maps above show temperature anomalies, or changes, for 2000-2009 (top) and 1970-1979. The maps do not depict absolute temperature, but how much warmer or colder a region is compared to the norm for that same region from 1951-1980.” This allows scientists to get a grasp of the overall global climate change, rather than focusing on localized, fluctuating temperatures.
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