The Carbonn Climate Registry (CCR) was founded in November 2010 at the World Mayors Summit on Climate in Mexico City, but it is operated by the Bonn Center for Local Climate Action and Reporting. The latter is hosted by the ICLEI World Secretariat, also in Bonn. Accordingly, CCR states on its website:

The Carbonn® Climate Registry is the leading global reporting platform for cities, towns and regions tackling climate change. It helps local and other subnational governments to track and report on their targets, actions and performance. This platform allows for exchange, learning and benchmarking among its 950+ registered entities while providing data that feeds into global climate negotiations through ICLEI as focal point for the Local Governments and Municipal Authorities constituency.

World Mayors Summit? Once again, not an official governmental agency, but an ad hoc special interest group with NO power to enforce their ideas.

Which cities in NH belong to ICLEI? Keene, Nashua, Portsmouth, Wolfeboro. It is not certain if Epping or Wolfeboro still belong, but the ICLEI website has them listed on this website:
http://wakefieldcap.org/archivewakefieldcap.org/Proposal/ICLEI_Local%20Governments_Apr07.pdf

ICLEI Drives World’s Cities Into Global Carbon Reporting Machine