The International Energy Agency (IEA) warns that China’s potential rare-earth export curbs could threaten up to $6.5 trillion in downstream production outside China each year if fully implemented. The IEA makes the estimate in a broader report on rare earths and critical minerals, highlighting how supply chains remain highly concentrated despite some recent efforts to diversify. It argues that disruptions can quickly affect manufacturing and trade because critical minerals are often concentrated in small volumes yet underpin a wide range of industries. The report says governments and industry should pursue risk-management measures, including multinational stockpiling of 11 “high-risk” materials. It estimates an initial purchase cost of $9.2 billion and a net annual cost of $900 million for the stockpiling approach. The IEA also points to the geopolitical context, including last year’s US-China trade tensions and China’s export restrictions, which affected businesses that rely on rare earths for applications such as satellites and smartphones. While some diversification has begun—supported by investments in areas like rare earth refining—the IEA notes that geographic concentration, particularly in refining, is still increasing in several mineral categories.