Describing the concept of a "global temperature" as thermodynamically and mathematically impossible, Professor Bjarne Andresen of The Niels Bohr Institute at the University of Copenhagen throws in a great quip on the topic of global warming.
He explains that while it is possible to treat temperature statistically locally, it is meaningless to talk about a global temperature for Earth. The Globe consists of a huge number of components which one cannot just add up and average. That would correspond to calculating the average phone number in the phone book.
By way of Steve Antler.
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