The carbonn© Climate Registry (cCR) was launched at the World Mayors Summit on Climate in Mexico City on 21 November 2010 under the name carbonn Climate Registry (cCCR), as the global response of local governments to measurable, reportable and verifiable (MRV) climate action.
The cCR is a global mechanism developed for local governments by local governments. It enables them to publicly and regularly report their local climate action developments: