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The document proposes a framework for determining 'fair shares' of global mitigation based on national capacity and responsibility. Using the Climate Equity Reference Calculator, it analyzes the United States, China, the EU-28, and India, finding that wealthy, high-emitting nations often have fair shares exceeding their domestic mitigation potential, necessitating international support for others. It concludes that current pledges, such as the EU's 40% target, fall significantly short of what would be required for a 2°C pathway if matched by comparable global efforts.