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Explore a comprehensive conference session from the 2011 AGU Fall Meeting focused on multidisciplinary studies of elements critical to 21st century economies. Delve into geological, technological, and political-economic constraints on future supplies of critical elements. Examine lithium resources for the 21st century and investigate the characteristics of zircon suitable for rare earth element extraction. Learn about marine ferromanganese deposits as potential sources of rare metals for high- and green-tech applications, comparing them with land-based deposits. Gain insights into the aqueous geochemistry of trivalent rare earth elements, gallium, and indium at temperatures up to 250°C. Enhance your understanding of the complex interplay between geology, technology, and economics in the context of critical elements essential for modern industries and green technologies.