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This research paper by the World Resources Institute evaluates the transparency of greenhouse gas (GHG) emissions targets in the Intended Nationally Determined Contributions (INDCs) of eight major emitting economies. Using the 'Open Book' framework, the paper identifies transparency gaps that hinder the assessment of national and global ambition, particularly regarding land-sector accounting and market mechanisms. It provides estimated emissions trajectories through 2030 to quantify uncertainties resulting from these gaps and offers recommendations for governments and UNFCCC negotiators to improve reporting clarity.