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The document outlines a comprehensive framework for tracking global climate finance, focusing on real-economy investments in mitigation, adaptation, and dual-benefit activities. It defines a multi-layered taxonomy covering finance origins (domestic, international, indeterminate), actors (public, private, third-sector), and financial instruments. The methodology emphasizes a conservative approach to avoid double counting and carbon lock-in, utilizing a mix of primary project-level data and secondary market-sizing benchmarks from sources like the IEA and BNEF. Key 2025 updates include the integration of Luxembourg Green Exchange bond data, a new project-level hydrogen investment dataset, and the first-time inclusion of 2- and 3-wheeler electric vehicle sales in China and India.