Last week, C40 staff and partners attended Smart City Expo World Congress in Barcelona and showcased innovative approaches to climate action across transportation, energy and urban planning.| C40 Cities
Tshwane and C40 welcomed representatives from 12 African cities for two days of discussions about ways to address the climate crisis while boosting development.| C40 Cities
Unleashing the power of urban just transitions With nearly 16 million green jobs worldwide, mega-cities are key to driving inclusive...| C40 Cities
Discover how Johannesburg is tackling air pollution through the Pause and Breathe campaign, research, and bold actions to protect public health.| C40 Cities
Discover how C40 mayors are driving change at London Climate Action Week to build fairer, healthier, and more resilient cities.| C40 Cities
Discover how cities are accelerating climate action in the new report “From Paris to Belém: A Decade of Local Climate Leadership”.| C40 Cities
C40 Cities and the City of Bengaluru co-hosted a first-of-its-kind inclusive climate action (ICA) workshop themed “Participatory Practices for Inclusive...| C40 Cities
A decade after the Paris Agreement, urban climate leadership is driving progress from the ground up In the last decade,...| C40 Cities
Learn more about the UCAP CAI convening hosted by Jakarta and what countries in the region are doing to progress climate finance.| C40 Cities
The Bruhat Bengaluru Mahanagara Palike (BBMP), in partnership with Bengaluru Solid Waste Management Limited (BSWML) and C40 Cities, is advancing...| C40 Cities
The global development community gathered last week in Seville to discuss the future of development finance and the Sustainable Development Goals.| C40 Cities
Learn how cities like Chefchauoen are moving from commitments to real delivery to deliver urgent action and climate finance.| C40 Cities
London’s Green Economy Design Lab is helping close green skills gaps and building diverse workforces to meet city clean construction goals.| C40 Cities
London Climate Action Week 2025 showcased how cities lead on climate. Discover how mayors are shifting from negotiation to delivery.| C40 Cities
What leaders must do now to accelerate action, protect millions of lives and create thriving, water-safe cities.| C40 Cities
As COP28 discussions focus on food, agriculture and water, we look at how cities are enhancing climate resilience by tackling flooding and drought| C40 Cities
16 cities signed a commitment to address flooding and drought, and improve resilience by 2030| C40 Cities
The UrbanShift Africa forum highlighted the climate achievements and challenges of African cities as mayors across the continent continue to stand out as global climate leaders.| C40 Cities
C40 Cities and the Global Covenant of Mayors for Climate & Energy's new report looks at how national governments can increase finance for subnational climate action.| C40 Cities
Learn more about how C40 Cities and The Ramboll Foundation are working together to put communities at the heart of city planning.| C40 Cities
Learn more about how C40 Cities and the Centre for Liveable Cities' are working together to advance urban sustainability and resilience.| C40 Cities
Learn about the 2025 C40 World Mayors Summit in Rio de Janeiro just days before COP30 negotiations begin in Belém.| C40 Cities
Eric Garcetti joins the global cities network to boost climate diplomacy and support local action through national partnerships.| C40 Cities
In 2005, then-Mayor of London Ken Livingstone brought together 18 mayors from some of the world’s largest urban centers to determine how they could work together to cut carbon emissions and lead on global climate action. It was prompted by Mayor Livingstone’s own efforts to devise a London climate action plan, and the benefit his team gained from contacting some of what was then a small group of cities that were taking similar action.| C40 Cities
In the face of the Oslo housing crisis, tenants and councils are working together to reshape social housing that is fairer and more inclusive.| C40 Cities
C40's 2024 annual report is here. Read the foreword written by co-chairs Mayor of London Sadiq Khan and Mayor of Freetown Yvonne Aki-Sawyerr.| C40 Cities
A look at "The Future of Urban Consumption in a 1.5°C World,” a report published in 2019 by C40 Cities in collaboration with Arup and the University of Leeds.| C40 Cities
Today, C40 Cities launches VISIBLE, a project that will harness the power of cities to decarbonise their built environments in a way that is both just and economically viable.| C40 Cities
C40 Cities joins global leaders to unveil an ambitious US$800 billion city climate finance ask to drive clean energy, sustainable transit, and affordable, energy-efficient housing in cities worldwide.| C40 Cities
The C40 Cities Finance Facility (CFF) is excited to announce its latest ‘Call for City Applications’ to advance climate action infrastructure projects with cities in the Global South.| C40 Cities
Copenhagen Climate Ministerial advances innovative climate solutions at first-ever meeting with subnational governments Copenhagen, Denmark (7 May 2025) – COP30...| C40 Cities
Multilateral Development Banks (MDBs) convened to discuss plans to scale up and improve access to climate finance for cities.| C40 Cities
Pope Francis was a true global leader whose commitment to climate justice has inspired millions. Mark Watts, the Executive Director of C40 Cities has paid tribute to him.| C40 Cities
For Europe to lead in sustainable industry and achieve its climate goals, the Clean Industrial Deal must be bold, ambitious, and city-focused.| C40 Cities
Negotiations at the International Maritime Organization end in a low-ambition agreement, ruling out a carbon levy on shipping emissions.| C40 Cities
Austin, Miami, New York and Washington D.C have joined forces to participate in the C40 Heat, Health, and Equity Challenge Fund.| C40 Cities
A public statement by C40 Co-Chairs, Mayor of London and the Mayor of Freetown, at the WHO Conference on Air Quality in Cartagena, Colombia.| C40 Cities
Brazil announced the 50 cities selected for the first phase of Brazil’s world-leading Green Resilient Model Cities Program.| C40 Cities
Laneshift: Rio de Janeiro has taken a step toward sustainable mobility with its first public fast-charging station.| C40 Cities
City representatives and financial experts gathered to explore financing opportunities for municipal solid waste initiatives.| C40 Cities
C40 Cities joins the Coalition for Higher Ambition in urging bold, science-based EU targets for 2040.| C40 Cities
City representatives from three continents gather in Medellín, Colombia, to focus on accelerating the decarbonisation of public buildings.| C40 Cities
C40 Cities, a global network of nearly 100 mayors united in climate action, is pleased to announce that Mete Coban...| C40 Cities
The Journal of City Climate Policy and Economy is seeking original research and policy guidelines for an open-call issue due to be published in August 2026.| C40 Cities
The Healthy Cities Challenge by Novo Nordisk and C40 has selected 3 winning projects to enhance community health.| C40 Cities
IBM and C40 Cities will collaborate through the IBM Sustainability Accelerator and scale up social innovation action in cities.| C40 Cities
New C40 research shows the greener the construction sector, the greater the socio-economic benefits in cities.| C40 Cities
Can universal principles of climate equity and justice be applied across different geographies in the context of climate resilience, or...| C40 Cities
Despite President Trump's withdrawal of the US from the Paris Climate Agreement, mayors are united in action to confront the climate crisis.| C40 Cities
What demands do mayors have for national leaders at the G20 Summit and COP29, following a successful U20?| C40 Cities
C40's VISIBLE project, in partnership with Laudes Foundation, supports London, Madrid & Oslo in piloting clean construction initiatives.| C40 Cities
The Grundfos Foundation has renewed its support for the Water Safe Cities programme with a commitment of US$ 3.64 million over the next three years.| C40 Cities
2024 brought challenges for global climate action, but cities around the world continued to lead the way with creativity and determination.| C40 Cities
The updated United States Nationally Determined Contribution (NDC) charts a path to net zero, with targets that rely on cities' leadership.| C40 Cities
Foreword from the C40-MMC Task Force on Climate and Migration: 2021–2024 Impact Report by Mark Watts and Vittoria Zanuso| C40 Cities
Casablanca, Morocco, is to become the newest member of C40 Cities on 1 January 2025| C40 Cities
Since 2022, C40’s Good, Green Jobs and Just Transition peer group has showcased how climate action can good green jobs.| C40 Cities
Thought Leadership| C40 Cities
Statement| C40 Cities
Ibrahima Cissé, Minister Governor of the Autonomous District of Abidjan, Côte d’Ivoire, has been elected Vice Chair for Africa of the C40 Steering Committee.| C40 Cities
At the Climate Action Implementation (CAI) Africa Regional Academy, Lagos announces the launch of the Ikosi Fruit Market biogas plant, which diverts organic waste and provides cooling and lighting energy to improve livelihoods.| C40 Cities
Cities are essential to accelerating climate action with a transformative vision for COP30 and future COP summits. Empowering local leaders to drive implementation can shift COPs from negotiation to action delivering solutions rooted in accountability, inclusion, and tangible progress.| C40 Cities
C40 Cities reflects on the outcomes of COP29 in Baku, Azerbaijan, and what it means for cities as they lead the climate fight.| C40 Cities
C40 and Carrier will work together to support cities in the midst of extreme heat events in cities.| C40 Cities
C40 Cities partners with NUS Cities, pledging to help city leaders tackle the challenges of the climate emergency.| C40 Cities
Press Release| C40 Cities
More than 70 mayors and city leaders from around the world will arrive in Rio de Janeiro this week for the annual Urban 20 Summit (U20).| C40 Cities
New national polling on the eve of the U20 and G20 Summits in Rio de Janeiro has revealed that nearly...| C40 Cities
C40 Cities Co-Chairs Mayors Sadiq Khan and Yvonne Aki-Sawyerr and C40 Executive Director Mark Watts reaffirm mayors' commitment to tackling the climate crisis following Donald Trump’s election.| C40 Cities
C40 Cities, Community Jameel and UrbanShift launch a new 'Climate Action Guide for Urban Planners' at the World Urban Forum in Cairo, Egypt.| C40 Cities
Through C40’s Youth Reinventing Cities design competitions, youth actively play a role in shaping a greener, more just urban future for all.| C40 Cities
Ahead of the Smart City Expo World Congress in Barcelona, C40 has teamed up with Reckitt to urge businesses to take climate action in cities.| C40 Cities
Partners of the LA - Long Beach - Shanghai Green Shipping Corridor launch their inaugural progress report, outlining milestones and next steps.| C40 Cities
In Focus| C40 Cities
Lessons from C40's masterclass on loss and damage and inclusive climate action in Addis Ababa| C40 Cities
C40 Co-Chair and Mayor of Freetown, Yvonne Aki-Sawyerr, has welcomed the International Energy Agency’s (IEA) call for a people-centred clean energy transition| C40 Cities
Learn about C40 Cities' It's in the Air campaign, which focused on clean air zones as a major solution to the ongoing climate crisis.| C40 Cities
C40's highlights from the 2024 Climate Week in New York City| C40 Cities
The Rockefeller Foundation announced a new initiative to help cities tackle the health impacts of climate breakdown, including working with C40 Cities.| C40 Cities
C40 Co-Chair Mayor Sadiq Khan was joined by actor and water advocate Matt Damon and fellow Water.org co-founder Gary White at The Climate Pledge Summit.| C40 Cities
C40 Cities Executive Director Mark Watts has congratulated the City of Fortaleza for winning the prestigious WRI Ross Center Prize for Cities for pioneering a first-of-its-kind climate budgeting project.| C40 Cities
C40 and The Climate Pledge are joining forces with the financial sector to develop products that address specific market needs for last-mile delivery in Latin America.| C40 Cities
Find out what C40 Cities and our global mayors are up to at Climate Week New York City 2024.| C40 Cities
The Pact was released today by the UN Secretary-General at the Summit of the Future in New York City The...| C40 Cities
Ahead of the UN Summit of the Future, mayors are urging Heads of State to step up action and leave fossil fuels behind.| C40 Cities
