The consequences of high electricity demands and low heat demands in the chemical proxy of ecoinvent for climate change impacts are illustrated in figure . The median cradle-to-gate climate change impacts per functional unit (FU) in ecoinvent are about 45 % lower than in IDEA (2.5 kg CO2e instead of 4.4 kg CO2e). The reason is not that straightforward to trace back because the use of black box PlasticsEurope datasets by ecoinvent as part of the chemical supply chains obscures which emission sources are responsible. As there is still a major overlap in coverage between both the ecoinvent and the IDEA database with regards to the bulk chemicals, and PlasticsEurope data mostly plays a role for the polymer supply chains, but not for most inorganic chemicals, this is not sufficient to explain the major mismatch in climate change scores. These can largely be attributed to heat inputs, which are on average about five times lower in ecoinvent in comparison to IDEA.