Enterprises are at the forefront of climate actions and multinational enterprises (MNEs) engage in foreign direct investment, allowing them substantial influence over the entire supply chain. Yet emissions embodied in the international supply chains of MNEs are poorly known. Here we trace the carbon footprints of foreign affiliates of MNEs and show that the gross volume of global carbon transfer through investment peaked in 2011, mainly driven by the decline in carbon intensity. Despite declining carbon footprints of developed country-based MNEs, there has been a notable increase in carbon transfer sourced from the Chinese mainland. We propose an investment-based accounting framework to allocate carbon footprints of MNEs to the investing country. Investment-based accounting of emissions could inform targeted and effective climate policies and actions. For instance, some large MNEs play a crucial role in carbon transfer, therefore their originating country should bear more responsibilities of carbon emission reduction as an investor.
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This study uses a newly published time series inter-regional input–output table61 that is constructed by the Organization for Economic Co-operation and Development (OECD) and captures firm heterogeneity for 60 regions (http://www.oecd.org/sti/ind/analytical-AMNE-database.htm). The other data adopted by this study are bilateral FDI stock data from the OECD (https://www.oecd-ilibrary.org/finance-and-investment) and the United Nations (https://unctad.org/en/Pages/DIAE/FDI%20Statistics/FDI-Statistics-Bilateral.aspx)61,62, sectoral CO2 emissions data from the International Energy Agency (https://www.iea.org/data-and-statistics)63 and emissions data of selected MNEs from their sustainability reports (Supplementary information 3). Those data can be freely downloaded as public data. We also provide a detailed explanation of these data in the Supplementary Information.
The code of the method is available at Mendeley Data for academic use (https://data.mendeley.com/datasets/xcgs9xjhp9/draft?a=72300da9-59f1-43ac-8e64-ce19d31208e3).
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The authors gratefully acknowledge the financial support from National Key R&D Program of China (grant no. 2018YFC0213600), National Natural Science Foundation of China (grant nos. 71974141, 71690243, 71603179, 71834004, 71733002, 71673198, 41921005 and 91846301), UK Natural Environment Research Council (grant nos. NE/N00714X/1 and NE/P019900/1), British Academy (grant no. NAFR2180103) and the Fundamental Research Funds for the Central Universities in UIBE (grant no. CXTD7-06).
The authors declare no competing interests.
Peer review information Nature Climate Change thanks Yuhuan Zhao and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.
Publisher’s note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Extended Data Fig. 1 Changing trends of CO2 emissions embodied in supply chains of MNEs’ foreign affiliates.
The changing trends of the annual volume of the carbon footprints of MNEs’ foreign affiliates and the share of MNEs’ carbon footprints to global emissions. Please refer to Supplementary Information 1.1 for detailed explanation.
The volume of carbon emissions embodied in supply chains of MNEs is comparable to the volume of carbon emissions embodied in international trade at global level. Please refer to Supplementary Information 1.1 for detailed explanation.
MNEs hosted by the Chinese mainland correspond to the largest volume of carbon footprint, followed by the EU and the U.S. The volume of carbon footprints of MNEs originating from the Chinese mainland was significantly lower than that of the U.S. and the EU. There was a significant increasing trend in the carbon footprint of MNEs originating from the Chinese mainland. Please refer to Supplementary Information 1.2 for detailed explanation.
Extended Data Fig. 4 CO2 emissions related to MNEs under investment-based and production-based accounting in 2016 (Mt).
The figure shows that the developed countries outsourced embodied carbon emissions to the developing countries through FDI. Please refer to Supplementary Information 1.3 for detailed explanation.
The figure shows that the share of CO2 emissions related to foreign-owned firms is greater than the share of value added for most regions. Please refer to Supplementary Information 1.5 for detailed explanation.
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Zhang, Z., Guan, D., Wang, R. et al. Embodied carbon emissions in the supply chains of multinational enterprises. Nat. Clim. Chang. 10, 1096–1101 (2020). https://doi.org/10.1038/s41558-020-0895-9
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