Our Partners & Funders

Strategic Funders

The work of C40 is made possible through the generosity of a growing number of partners and supporters that share our goals and objectives.

Bloomberg Philanthropies

Strategic Funder

C40 was strengthened in 2011 by a strategic and multi-year grant from Bloomberg Philanthropies, which helped to forge the closer alliance with the CCI Cities Program and position the combined effort as one of the preeminent climate action organisations in the world.

Children's Investment Fund Foundation (CIFF)

Strategic Funder

The Children's Investment Fund Foundation (CIFF) is an independent, philanthropic organisation. Our staff and Trustees combine the best of business and the best of development, bringing a wealth of experience from both sectors to CIFF's work. We aim to demonstrably improve the lives of children in developing countries by achieving large-scale, sustainable impact. We believe that every child deserves to survive, thrive and mature into adulthood in a supportive and safe environment. However, climate change disproportionately affects children living in poverty in developing countries. A key focus for CIFF is climate-smart urbanisation.

Watch Shirley Rodrigues, Director, Climate Change at CIFF, discuss the efforts of C40’s mayors to implement and share best practice and feasible solutions to tackling climate change around the world.



Strategic Funder

Realdania is a modern philanthropic association that works to create quality of life and benefit the common good by improving the built environment: cities, buildings and the built heritage. Realdania grew out of a 150 year old mortgage credit association whose credit activities were sold off in 2000. Over the past 13 years Realdania has engaged in a total project value of approximately EUR 3.7 billion. Realdanias grants accounted for EUR 1.9 billion.

Watch Jesper Nygard, CEO of Realdania, discuss the power of C40 to unite strong and dedicated city leaders in the fight against climate change.

Other Funders & Partners

C40's partners understand the relationship between cities and climate change and are committed to advancing urban leadership in driving solutions. C40 is grateful to be working with a growing number of dedicated partners.

Clinton Climate Initiative, Clinton Foundation


C40 works in an aligned partnership with the Clinton Climate Initiative (CCI) Cities program, which was started by the Clinton Foundation.

Watch 42nd President of the United States, William J. Clinton, founder of the Clinton Foundation and prominent champion of climate initiatives, wish C40 a happy 10th anniversary.



Arup is an independent professional services consortium that delivers innovative and sustainable solutions in a broad range of disciplines.

Arup is a firm that values learning. Our partnerships with global organisations like C40 enable an exchange of knowledge and ideas and help make a positive difference in society. Such partnerships reinforce our commitment to sustainability, both in the work we do for our clients and the way we run our business.

In June 2015, Arup signed a major partnership with C40, committing $1 million of consultancy support over three years to help cities take meaningful action against climate change. Read more about Arup’s partnership with C40 or watch the video below.

Since 2011, C40 has partnered with Arup to create the Climate Action in Megacities Report, a comprehensive analysis of what the mayors of the C40 megacities are doing to tackle climate change.


World Bank


In 2011, C40 partnered with the World Bank in an agreement announced during the C40 Mayor’s Summit in Sao Paulo. This agreement will strengthen cooperation between the two organisations by establishing a consistent approach to cities’ climate action plans and greenhouse gas emissions measurement and reporting. Common international metrics will help to better track progress against targets. Equally important, metrics will facilitate cities' access topublic and private sources of capital for climate mitigation and adaptation projects. The World Bank offers a single entry point for C40 cities to access World Bank climate change-related capacity building and technical assistance programs, and climate finance initiatives. This ‘one window’ access helps city governments understand what World Bank resources exist and how to tap into them.

Ford Foundation


The Ford Foundation's goals are to strengthen democratic values, reduce poverty and injustice, promote international cooperation and advance human achievement. The Ford Foundation is working with C40 to support global cities to become more compact and connected, thereby minimising vehicle kilometres travelled and increasing access to public transportation while also increasing economic prosperity by connecting housing to economic and employment opportunities.



In June 2011, C40 partnered with ICLEI — Local Governments for Sustainability. This partnership will establish a global standard for accounting and reporting community-scale greenhouse gas emissions that can be used across multiple platforms. It can help local governments accelerate their emission reduction activities, whilst meeting the reporting requirements of climate financing and national monitoring entities.

World Resources Institute


C40 is partnered with the World Resources Institute (WRI) along with ICLEI – Local Governments for Sustainability (ICLEI) to develop the Global Protocol for Community-Scale GHG Emissions (GPC) Pilot v 1.0.  This guide—which is now concluding its pilot-testing phase—is set to become the first internationally accepted framework for city-level GHG inventories. 

Watch World Resources Institute President & CEO Andrew Steer congratulates C40 on 10 years of results.



C40 began partnering with CDP (formerly The Carbon Disclosure Project) in June 2011 to bring self-reported data from the world’s largest cities into a comprehensive report on cities’ greenhouse gas emissions and climate risk data. Today, the collaboration includes C40-specific open data portals, premised on the belief that better, more transparent measurement leads to better management. With the right processes in place in partnership with CDP, cities can share strategic insights and reduce their exposure to climate risks and impacts. 



Siemens supports C40's Measurement and Planning Initiative, which is an effort dedicated to enhancing each member city’s ability to measure data, take action and track progress towards self-identified goals.  In this partnership, Siemens’ provides direct technical expertise to C40 member cities. In April 2013, the C40 Cities Climate Leadership Group (C40) and Siemens launched a global awards competition to recognize cities that are demonstrating leadership through the implementation of scalable solutions to address global climate change. The inaugural City Climate Leadership Awards was held at the Crystal in London in September 2013. The 2014 Awards was held in New York City in September 2014. C40 and Siemens initiated the City Climate Leadership Awards in 2013 and Siemens was partner for years 2013 and 2014.

Citi Foundation


Citi Foundation supports the climate finance activities of C40 Cities, with the goal of supporting initiatives that lower C40 city carbon emissions and reduce the impacts of climate change. Citi offers direct access to its climate finance research and finance teams on a pro bono basis, where invited by C40 cities. The partnership also organizes forums and seminars jointly.

International Advertising Association


The International Advertising Association (IAA) has partnered with C40 to launch #CitiesAreKey, a new global social and digital ad campaign designed to amplify the leadership role of cities in the lead-up to the international COP21 climate negotiations in Paris in December. The campaign, announced via continuous ads on the iconic ‘Grand Screen’ digital billboard throughout the weeklong Cannes Lions International Festival of Creativity, will capitalize on key moments on the Road to Paris to spread global awareness about cities’ potential to help deliver emissions reductions necessary by 2020 to limit global warming to two degrees Celsius. Sponsoring and creative partners on the effort also include Clear Channel Outdoor (CCO) and DM9 Jayme SyFu (DM9).

Climate and Clean Air Coalition


A transformative global partnership of countries, international organizations, NGOs, and the private sector, seeking to rapidly reduce short-lived climate pollutants (SLCPs) like black carbon, methane, and HFCs. Together with C40, the CCAC launched the Municipal Solid Waste Initiative at the UN Rio+20 conference, where Michel Bloomberg, former Mayor of New York, former President Bill Clinton, and Governor Babatunde Fashola of Lagos, Nigeria encouraged cities around the world to join.

This partnership brings together organizations and governments with decades of experience across the municipal solid waste sector, including: U.S. EPA, Environment Canada, Ministry of Environment Japan, the Global Methane Initiative, the World Bank, the UN Environment Programme, the International Solid Waste Association, the Clinton Climate Initiative Waste and Water Team, the Center for Clean Air Policy, the Institute for Global Environmental Strategies, and many others. The partnership brings together technical experts, policy-makers, and cities to learn, plan, and take action.



EMBARQ is a program of the World Resources Institute in Washington, D.C. EMBARQ’s mission is to catalyze and help implement sustainable transport solutions to improve quality of life in cities.

C40 and EMBARQ signed an MOU in January 2013, committing to work together towards shared goals of reducing global greenhouse gas emissions and supporting adaptation and mitigation measures through sustainable transportation policies and projects.

Institute for Transportation and Development Policy (ITDP)


The Institute for Transportation and Development Policy (ITDP) provides technical transport and planning expertise to local authorities in cities around the world – promoting transport solutions that cut greenhouse gas emissions, reduce poverty, and improve the quality of urban life.

C40 and ITDP signed an MOU in June 2012 to work together towards shared goals of reducing greenhouse gas emissions and supporting adaptation measures through sustainable and equitable transportation policies and projects in C40 cities.