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Which countries can competitively export complex environmental goods, and which green products sit closest to their existing capabilities. Built on the OECD Combined List of Environmental Goods and TradeWeave's product space engine (RCA, PCI, proximity density).
Source: OECD (2014), Combined List of Environmental Goods (CLEG), 248 HS2007 codes; OECD Trade and Environment Working Paper 2014/03, Annex 1 (retrieved 2026-05-28) | BACI 202501 (CEPII), HS92, 1995-2024 (retrieved 2026-04-28) | OECD GHG footprints in global production networks (TECO2 successor), 1995-2022
Methodology: Green-products classification: OECD Combined List of Environmental Goods (CLEG), which unions the WTO Friends list (2009), the APEC list (2012) and a modified PEGS list into 248 HS2007 six-digit codes. Mapped to HS92 via the CRAN concordance hs3_hs0 crosswalk, the 248 codes resolve to 244 distinct BACI HS92 products (four HS2007 lines were splits of single HS92 lines and merge back). The Green Complexity Index follows Mealy & Teytelboym (2022, Research Policy): the PCI-weighted sum of green products in which a country has RCA >= 1; their own green-products list is available on request only and is not used here. Opportunity density per Hidalgo et al. (2007). Coverage: 244 of 5,022 HS6 products tagged green; 233 of 238 countries scored; embodied-CO2 for 80 economies, 1995-2022.