The production of inorganic fertilizers, in contrast, is a sub-sector within the ecoinvent chemical sector, whose supply chains are more separate from the rest of the chemical sector, and which has been updated in 2020 with process-specific data. Accordingly, the results of ecoinvent and IDEA are in better agreement for systematic fertilizers than for other chemical groups (figure ). There are even some nitrogen fertilizer datasets, which show substantially higher climate change impacts scores in ecoinvent than in IDEA. A reason for this difference is possibly the influence of coal-based ammonia production in China, which leads to higher direct CO2 emissions than the conventional natural gas-based ammonia production, but is only covered by ecoinvent and not by IDEA.