The comparison of climate impacts of other organic chemicals between both databases shows a trend towards higher impacts calculated from IDEA. In part, this is due to differences in a few key intermediate chemicals that are then used in the manufacturing of many derivatives. For example, ethylene and propylene as key intermediates for the entire chemical sector have been adapted in ecoinvent from Plastic-sEurope data, which uses outdated background supply chain data and is based on other modeling principles and allocation assumptions than ecoinvent (or IDEA) . These two chemicals have lower impacts in ecoinvent than in IDEA and 40 thus contribute to lower overall climate impacts of organic chemicals in ecoinvent. In addition, as has been shown earlier in figure , there is also a large share of proxy use among basic organic chemicals in ecoinvent. The influence of this proxy use is visible in the climate change impacts related to electricity and heat. Many organic chemicals in ecoinvent have either the black box datasets for ethylene or propylene production in their supply chain, which obscure part of their heat and electricity impacts. Consequently, the distinguishable climate change impacts in ecoinvent should be lower than in IDEA, tion, the data availability on inorganic chemical production is more limited than for other types of chemicals, so ecoinvent uses proxy data frequently while IDEA again is relying more on process simulations and reported process-specific data. Higher climate change impacts in IDEA compared to ecoinvent arise both from substantially higher electricity and heat demands. That is also in line with literature recommendation by that suggest to use proxy electricity and heat inputs for inorganic chemicals of 1.9 MJ kg -1 and 5.1 MJ kg -1 , respectively, while the current ecoinvent proxy approach would only suggest values of 1.5 MJ kg -1 and 2.35 MJ kg -1 instead (5). Thus, the proxy electricity demands in ecoinvent, that on average overestimate electricity demands and are strongly based on organic chemicals production, are still not high enough of match the even higher electricity demands for many inorganic chemicals in IDEA. In addition, the heat demands for inorganic chemicals production in ecoinvent also tend be substantially lower than in IDEA among the compared substances. A particularly strong mismatch between ecoinvent and IDEA climate change impact scores is observed for ferric chloride (FeCl3), a chemical that is very commonly used as a flocculant in wastewater treatment and drinking water production. Ecoinvent has partly adapted the supply chain of ferric sulfate (Fe2(SO4)3) as a proxy, which may be a main reason for the deviations in climate change impacts and should trigger an investigation about more appropriate alternatives. At the same time, impacts of inorganic chemicals are sensitive to cut-off and allocation choices in their respective LCI databases due to their metal content, which may also need further analysis.