TITLE

A synthesis of carbon in international trade

AUTHOR(S)
Peters, G. P.; Davis, S. J.; Andrew, R.
PUB. DATE
August 2012
SOURCE
Biogeosciences;2012, Vol. 9 Issue 8, p3247
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
In a globalised world, the transfer of carbon between regions, either physically or embodied in production, represents a substantial fraction of global carbon emissions. The resulting emission transfers are important for balancing regional carbon budgets and for understanding the drivers of emissions. In this paper we synthesise current understanding in two parts: (1) CO2 emissions embodied in goods and services that are produced in one country but consumed in others, and (2) carbon physically present in fossil fuels, petroleum-derived products, harvested wood products, crops, and livestock products. We describe the key differences between studies and provide a consistent set of estimates using the same definitions, modelling framework, and consistent data. We find the largest trade flows of carbon in international trade in 2004 were fossil fuels (2673MtC, 37% of global emissions), CO2 embodied in traded goods and services (1661MtC, 22%of global emissions), crops (522MtC, 31% of total harvested crop carbon), petroleum-based products (183MtC, 50% of their total production), harvested wood products (149MtC, 40% of total roundwood extraction), and livestock products (28MtC, 22% of total livestock carbon).We find that for embodied CO2 emissions, estimates from independent studies are robust, and that differences between individual studies are not a reflection of the uncertainty in consumption-based estimates, but rather these differences result from the use of different production-based emissions input data and different definitions for allocating emissions to international trade. After adjusting for these issues, results across independent studies converge to give less uncertainty than previously assumed. For physical carbon flows there are relatively few studies to be synthesised, but differences between existing studies are due to the method of allocating to international trade, with some studies using "apparent consumption" as opposed to "final consumption". While results across studies are sufficiently robust to be used in further applications, more research is needed to understand differences and to harmonise definitions for particular applications.
ACCESSION #
79919633

 

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