Because EU member states wanted to maintain sovereignty over their fundamental institutions when the EU-ETS was implemented in 2005, the European Commission set up an emissions trading scheme with carbon permit registries in each member country, meaning that there are now 30 semi-independent registries (including non-EU member states) across Europe that keep track of trading and ensure the credibility of the carbon permits.
Dahil gusto EU member states upang mapanatili ang soberanya sa kanilang saligang institusyon kapag EU-ETS ay ipinatupad noong 2005,-set up ang European Commission ng emissions kalakalan pamamaraan sa Registry carbon permit sa bawat bansang kasapi, na nangangahulugan na may mga ngayon 30 semi-independiyenteng Registry (kabilang ang mga non-EU miyembro estado) sa buong Europa na masubaybayan ang kalakalan at matiyak ang kredibilidad ng carbon permit.