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The EU Carbon Border Adjustment Mechanism (CBAM) is a regulatory tool designed to prevent 'carbon leakage' by applying a carbon price to specific imported goods, matching the price paid by EU producers under the EU Emissions Trading System (EU ETS). The mechanism covers cement, iron and steel, aluminium, fertilisers, electricity, and hydrogen. It involves a transitional monitoring period starting in October 2023, followed by a definitive phase-in in 2026. Importers must purchase and surrender non-tradeable certificates based on the embedded emissions of their goods. The document highlights the necessity of phasing out free ETS allowances to ensure the CBAM's effectiveness and discusses the potential for reinvesting CBAM revenues into climate mitigation in developing economies.