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This methodology report from the Stockholm Environment Institute introduces the Transnational Climate Impacts (TCI) Index, a framework designed to quantify country-level exposure to climate impacts that occur in one location as a consequence of climate events elsewhere. The report details the selection of nine indicators across four risk pathways—biophysical, finance, people, and trade—plus a global context indicator, to identify how international interconnections and dependencies create climate-related risks for nations regardless of their internal vulnerability.

This policy brief introduces the Transnational Climate Impacts (TCI) Index, a framework developed by the Stockholm Environment Institute to measure country-level exposure to climate risks that cross national borders. The brief argues that globalization connects countries through biophysical, financial, human, and trade pathways, meaning that even wealthy nations with low direct physical vulnerability can be highly exposed to transnational climate risks. It recommends that the UNFCCC and national governments integrate these transnational dimensions into adaptation planning and finance to ensure global economic stability.