Greenhouse gases emissions are aggregated using 100-year global warming potential (GWP) from AR2 (IPCC, 1995)

Emission coefficients by stage and polymer or end-of-life fate are extrapolated from 2015 data using indexes. These indexes are built on scope-2 emissions intensity of primary and secondary plastics production (incl. upstream sectors) from the OECD ENV-Linkages model.