This month marks an important milestone – an agreed to greenhouse gas (GHG) emissions protocol for cities was announced jointly by ICLEI – Local Governments for Sustainability, C40, the big-cities climate change club, and the World Resources Institute (WRI). The protocol builds on early work by ICLEI, WRI and WBCSD’s corporate scopes model, a research paper presented by Professor Chris Kennedy et al at the June 2009 Marseille Urban Research Symposium, and a joint UNEP, UN-Habitat, World Bank guideline, supported by Cities Alliance, launched June 2010 at the World Urban Forum in Rio de Janeiro.
Up to now there were many different types of ways that cities were measuring their GHG emissions. A few cities were leading. Rio’s one of the first cities to complete the new inventory. New York City, Amman, Cape Town, Tokyo and Mexico City are front-runners as well. Xiaolan and Kunming are lined up to be the first cities in China to use the new protocol. Soon, most cities that complete a GHG inventory will follow a common ISO standardized approach. This will make analysis and learning across cities much easier. A common and verifiable metric is also one of the best ways to attract additional finance for cities.