It should be noted that the synthesis routes of some chemi- GaBi background data, and may thus also be, to some degree, subject to influences from the use of the proxy data in ecoinvent. Furthermore, the use of such aggregated datasets adds intransparency and users cannot no longer adapt the supply chains to their own specific needs. In addition, the aggregated datasets may be base on different background data, including using outdated ecoinvent background data from ecoinvent v2. For example, some PlasticsEurope datasets have only been updated infrequently, and thus date back 15 or more years in many cases. Hence, in addition to intransparency, the aggregated PlasticsEurope data themselves may cause major consistency issues within the ecoinvent supply chains for chemicals.