A Danish scientist said the idea of a "global temperature" and global warming is more political than scientific.
University of Copenhagen Professor Bjarne Andresen has analyzed the topic in collaboration with Canadian Professors Christopher Essex from the University of Western Ontario and Ross McKitrick of the University of Guelph.
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This story gives a short summary of an academic paper which explains why a single average temperature value is not a useful metric for measuring global warming. Includes "warmer during the recent 50 years" context which is not in the paper, and no source given. Likewise "defined only for a homogeneous system" does not come from the paper. What the paper does say is similar, that "an average of temperature data sampled from a non-equilibrium field is not a temperature". Single viewpoint.
