Anassigned amount unit was a tradable "Kyoto unit" or "carbon credit" representing an allowance to emit greenhouse gases comprising "one metrictonne ofcarbon dioxide equivalent, calculated usingglobal warming potentials".[1][2] Assigned amount units were issued up to the level of initial "assigned amount" of anAnnex 1 Party to theKyoto Protocol.[3][4]
The "assigned amounts" were theKyoto Protocol Annex B emission targets (or"quantified emission limitation and reduction objectives") expressed as levels of allowed emissions over the 2008–2012 commitment period.[5]
Article 17 of theKyoto Protocol allowedemissions trading between Annex B Parties (countries). Parties that had "assigned amount units" to spare because of reductions in emissions below their Kyoto commitment set out in Article 3 and Annex B could sell those units to countries that had emissions exceeding their targets.[6] Article 17 also required that any such emissions trading must be supplemental to domestic action for the purpose of meeting quantified emission limitation and reduction commitments.
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