Abstract
This paper uses US county-level data and the Stochastic Impacts by Regression on Population, Affluence, and Technology framework to explore the extent of geographical variability in the process that links total emissions of carbon dioxide to measures of population, affluence, and technology. Geographically weighted regression models show that there is strong evidence of spatial heterogeneity in the estimated elasticities of emissions. While this research cannot explain these regional patterns, it may provide a useful starting point to examine in detail the nature of regional variation.
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Notes
I thank an anonymous referee for this point.
To calculate these variables, I use weather station data and geoprocessing tools to calculate average temperatures in counties with multiple weather stations and to assign the temperature of the weather station closest to those counties without weather stations. To convert these variables to logs, temperatures below zero are set to zero. There might be weather variability within counties that these measures do not capture. Also, researchers have documented problems with weather station data, for example, Christy (2012). Thus, these variables are imperfect proxies of climatic determinants of emissions. The results are robust to omitting these two variables.
For this test of geographical variability, the AICc of the GWR model is compared to the AICc of a model in which one of the coefficients is assumed to be global and not to vary locally while all other coefficients are allowed to vary locally. If the original GWR model fits the data better than the model with a global coefficient, there is evidence that this coefficient does in fact vary over the area of study (Nakaya et al. 2012).
I thank an anonymous referee for these insights about the extraction sector.
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Videras, J. Exploring spatial patterns of carbon emissions in the USA: a geographically weighted regression approach. Popul Environ 36, 137–154 (2014). https://doi.org/10.1007/s11111-014-0211-6
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DOI: https://doi.org/10.1007/s11111-014-0211-6