carbonn Climate Registry

What is the Compact of Mayors?

The Compact of Mayors is a global coalition of mayors and city officials committing to reduce local greenhouse gas emissions, enhance resilience to climate change and track their progress publicly. It is an agreement by city networks – and then by their members – to fight climate change in a consistent and complimentary manner to national efforts.

The Compact of Mayors was launched by UN Secretary-General Ban Ki-moon and his Special Envoy for Cities and Climate Change, Michael R. Bloomberg, under the leadership of the world’s global city networks – C40 Cities Climate Leadership Group (C40), ICLEI – Local Governments for Sustainability (ICLEI) and the United Cities and Local Governments (UCLG) –with support from UN-Habitat, the UN’s lead agency on urban issues at the 2014 United Nations Climate Summit.

The Compact provides a space to publicly recognize the impact of cities’ collective actions through standardized measurement of emissions and climate risk, and consistent, public reporting of their efforts.

How to participate

To join the Compact, a city leader must engage in the following four phases over a 3 year period. Each phase has a 2 step process: Mitigation and Adaptation.

Cities have up to three years to fulfill the requirements of Compact compliance, with the support of the Compact’s city networks and endorsing partners. You will receive official Compact of Mayors seals to use in your communication material when your city commits to the Compact of Mayors and when it has achieved compliance.

For more information consult the Compact of Mayors website

The reporting platforms

The carbonn® Climate Registry (cCR) and the CDP are both recognized reporting platforms for local governments joining or observing the Compact of Mayors. The cCR is also the designated central repository of the Compact of Mayors, meaning Compact data reported to the CDP will be fed into the cCR for aggregation.

The cCR is open for voluntary reporting to all levels of governments, from towns and cities to states, regions and provinces. The cCR has been designed to support and facilitate vertical integration, encouraging local governments within the same geographic region to report, also ensuring that data is not double-counted when aggregated.

The cCR is managed by the Bonn Center for Local Climate Action and Reporting (carbonn® Center) based in Bonn, Germany, hosted by the ICLEI World Secretariat.

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