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The report outlines a systematic approach to estimating bottom-up climate finance needs by extracting data from 167 NDCs. It distinguishes bottom-up needs—finance required by countries to reach national targets—from top-down needs, which are derived from predictive models for 1.5°C pathways. The methodology involves standardizing diverse data on sector classification, timeframes, and currency (converting to 2023 USD), while categorizing finance as unconditional (domestic) or conditional (international). The document acknowledges significant data gaps, noting that less than half of the reviewed NDCs provide fully costed needs, and that current bottom-up estimates are insufficient to align with a net-zero pathway.