![]() ![]() We present the results of the data updates and improved coverage. Furthermore, two case studies are carried out applying two different normalization reference areas (the EU 27 as normalization reference area and the world) for 2010. We analyzed the patterns in ADP over time and the contribution by different elements in the category total. ![]() We also explored the use of several variations: moving averages and cumulative production data. We used updated reserve estimates and time series of production data from authoritative sources to calculate ADPs for different years. Finally, category totals to calculate normalized indicator results have to be updated as well, because incomplete coverage of elements can lead to biased results. Furthermore, dealing with annually changing production data might have to be revisited by proposing new calculation procedures. These three aspects together can affect relative ranking of abiotic resources based on the ADP. Moreover, it was known that the coverage of elements by ADPs was incomplete. Since then, ADP values have not been updated anymore despite the availability of updates of annual production data and also updates of crustal content data that constitute the basis of the ultimate reserves. ![]() In addition, the impact category was sub-divided into two categories, using two sets of ADPs: the ADP for fossil fuels and the ADP for elements in this article, we focus on the ADP for elements. In 2002, ADPs were updated based on the most recent USGS annual production data. The ADP of a resource was defined as the ratio of the annual production and the square of the ultimate (crustal content based) reserve for the resource divided by the same ratio for a reference resource (antimony (Sb)). In 1995, the original method for assessing the impact category abiotic resource depletion using abiotic depletion potentials (ADPs) was published. ![]()
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