Certified emission reductions (CERs) are the tradeable units of the Clean Development Mechanism. CERs are defined in 9/CMP.1, Annex, paragraph 1(b) as follows:

A “certified emission reduction” or “CER” is a unit issued pursuant to Article 12 and requirements thereunder, as well as the relevant provisions in the annex to decision 3/CMP.1, and is equal to one metric tonne of carbon dioxide equivalent, calculated using global warming potentials defined by decision 2/CP.3 or as subsequently revised in accordance with Article 5 (9/CMP.1, Annex, paragraph 1(b)).

CERs can be used by Annex I Parties to meet their emissions targets, and can be added to a Party's overall quantified emission limitation and reduction commitment (2/CMP.1, paragraph 6).

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