Research Library

Open Data Portal
The Open Data Portal provides direct, interactive access to the wealth of statistical information provided annually by C40 cities. Through the Open Data Portal, it is possible to access and invest...
City Climate Hazard Taxonomy
Cities are key actors in building climate resilience because they are on the frontlines of climate change impacts, can take effective, direct action and are powerfully connected to find common solu...
Global Protocol for Community-Scale Greenhouse Gas Emission Inventories (Executive Summary)
On Monday during COP20, the World Resources Institute (WRI), C40 Cities Climate Leadership Group (C40) and ICLEI - Local Governments for Sustainability (ICLEI) unveiled the Global Protocol for Comm...
Urban Water Blueprint: Mapping Conservation Solutions to the Global Water Challenge
The Nature Conservancy, in partnership with C40 Cities Climate Leadership Group and the International Water Association, released a new report that analyzes the state of water in more than 2,000 wa...
The contribution of urban-scale actions to ambitious climate targets
Global Aggregation of City Climate Commitments: Methodology
Advancing Climate Ambition: Infographic
Advancing Climate Ambition: Cities as Partners in Global Climate Action
A report to the UN Secretary-General from the UN Secretary General’s Special Envoy for Cities and Climate Change, in partnership with the C40 Cities Climate Leadership Group Cities can contribute ...
Working Together: Global Aggregation of City Climate Commitments
Cities commitments drive significant action towards limiting greenhouse gas emissions. In fact, city governments with emissions reduction targets report three times greater emissions reduction acti...
Compact of Mayors
The Compact of Mayors is an agreement by city networks and then by their members to undertake a transparent and supportive approach to reduce city-level emissions, to reduce vulnerability and to en...