For the cradle-to-gate analysis, electricity and heat input data was identified in both the ecoinvent and IDEA databases, and their emission intensities were adjusted to 30 0.16 kg CO2e MJ -1 (33) and 0.1 kg CO2e MJ -1 (34) according to the data from PlasticsEurope, respectively. The value for heat input assumed a useful heat content of industrial steam of 2.8 MJ kg -1 . These emission intensity values were selected to mitigate impacts of energy data differences between the ecoinvent and IDEA databases, and also because the ecoinvent database uses a substantial subset of aggregated datasets from PlasticsEurope, within which emission intensities cannot be adjusted. Other greenhouse gas emissions in both databases were kept as they were. The resulting climate change impacts along 40 the chemical supply chains were calculated based on the 2013 Intergovernmental Panel on Climate Change (IPCC) GWP 100a method in the 2013 version and grouped into impacts resulting from electricity, heat and others (the latter includes unspecified emissions from aggregated PlasticsEurope datasets, direct process emissions of chemicals, and emissions from other parts of the supply chains). Finally, the environmental impacts of chemicals were compared between both databases with regards to their overall patterns and per chemical for a subset of 50 substances.