Global average surface temperature is an established climatologic metric to describe global warming (or cooling).1,2 Further information is available in the assessment of Working Group I of the Intergovernmental Panel on Climate Change.3
References
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Jones PD, New M, Parker DE, Martin S, Rigor IG. Surface air temperature and its changes over the past 150 years. Rev Geophys 1999;37:173-99.
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Jones PD, Moberg A. Hemispheric and large-scale surface air temperature variations: an extensive revision and an update to 2001. J Climate 2003;16:206-23.
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