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A June 2010 study by the European Union identified the REE as among the 14 mineral commodities most critical to the EU economy, but most deposits are located outside of Europe, with the majority found in China, the CIS (Russia, Kyrgyzstan and Kazakhstan), the USA and Australia.
Despite recent progress in improving the available knowledge base, the report notes, the emissions estimate still has large associated uncertainties, giving a range of 1,010-4,070 tonnes. The longer-term status of many of the newly established sites however depends on availability of sustained funding to continue operations.
This includes drastic price increases for new internal-combustion engine cars, to a reduction in their availability. A similar situation has been observed in countries such as Kazakhstan and Kyrgyzstan. From the beginning of 2025, new CAFE regulations came into force, with various scenarios now possible.
The model estimated potential worldwide emissions reductions of particulate and gaseous species on the basis of available real-world data on reduction efficiencies of these measures where they have been applied already and examined the impact of full implementation everywhere by 2030. Shindell et al., Supplementary material. Click to enlarge.
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