Towards a Theory of Decoupling: Degrees of Decoupling in the EU and the Case of Road Traffic in Finland between 1970 and 2001

Transportation literature often reflects the view that road traffic volumes are coupled with gross domestic product (GDP). Recently published studies also argue that the carbon dioxide (CO2) emissions from transportation, passenger cars in particular, have not shown any decoupling from transport volumes for several years. This article presents a theoretical framework for decoupling, defining the difference between decoupling, coupling and negative decoupling. These are further broken down to weak, strong and expansive/recessive degrees of decoupling, laying emphasis on the absolute increase or decrease of the variables. The result section presents data of the development of the relationships between GDP, traffic volumes and CO2 emissions from transport in the EU15 countries between 1970 and 2001, including the special case of Finnish road traffic. The aggregate EU15 data show a change from expansive negative decoupling to expansive coupling regarding passenger transport, and from weak decoupling to expansive negative decoupling regarding freight transport. Weak decoupling of transport carbon dioxide emissions from GDP could also be observed. Weak decoupling of all three aspects (freight, passenger and carbon dioxide) could be seen in the UK, Sweden and Finland in the 1990s. In Finland, the statistics show weak decoupling of GDP from road traffic volume and strong decoupling of road traffic volume and CO2 emissions from road traffic between 1990 and 2001. Four hypothetical explanations of the Finnish phenomenon are examined: policy towards sustainable mobility, green urban lifestyle, increasing income differences, and statistical misinterpretation.


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  • Accession Number: 01000487
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 23 2005 12:18AM