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The paper introduces a framework and a composite index, the Transnational Climate Impacts Index, to quantify how countries are exposed to climate change impacts occurring in other locations, emphasizing the interconnections of a globalized economy.

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.