Journal
APPLIED ENERGY
Volume 283, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.apenergy.2020.116271
Keywords
Built environment configurations; Traffic CO2 emission; Spatial autoregressive model
Categories
Funding
- Natural Science Foundation of Beijing, China [9204026]
- National Key Research and Development Program of China [2017YFA0603602]
- Tsinghua University SRT projects [1911T0051, 2011T0070]
- National Natural Science Foundation of China [71834005]
- Philosophy and Social Sciences Research of Higher Learning Institutions of Shanxi [201801010]
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The study suggests that altering urban built environment configurations can effectively reduce traffic CO2 emissions. Increases in built-up area size, compactness, and isolation are associated with increases in adjacent cities' traffic CO2 emissions. The spatial configurations of built environment impact both intracity and intercity motorized travels, indicating the necessity of establishing emission reduction strategies at the city agglomeration level.
Urban built environment regulations can effectively mitigate traffic CO2 emissions. Thus, it is critical to quantify the elasticities of altering built environment configurations. To address this issue, we have built nationwide spatial autoregressive models to differentiate between localized and spillover effects across 325 Chinese cities in the years of 2005 and 2015. Our results indicate that a 1% increase in built-up areas' size, compactness, and isolation is associated with increases of 0.35%, 0.14%, and 0.13%, respectively, in adjacent traffic CO2 emissions. The underlying reason is that the spatial configurations of built environment do not only systemically affect the probability, frequency, speed, and distance of intracity motorised travels, but also have impacts on the intercity transboundary mobility of motor vehicles. In addition, the built-up areas' compactness effect has an antagonistic relation with the per capita GDP effect. Thus, our findings provide evidence that the built environment configuration-related measures can benefit traffic CO2 emission reductions in adjacent cities. It is therefore necessary for policymakers to make a traffic CO2 mitigation strategy at the city agglomeration level.
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