Today, mayors, business leaders and climate experts came together across London to kick off London Climate Action Week 2026.
From tackling climate disinformation to unlocking investment for cities, leaders explored how collaboration across government, finance and technology can accelerate the transition to a cleaner and more resilient future.
A new way to tackle disinformation
In a digital world where outrage is rewarded more than accuracy and falsehoods spread faster than facts, cities are facing a growing challenge – climate disinformation.
Today, C40 Co-Chair Mayor Sadiq Khan announced the launch of City Climate Facts, a new initiative that will help cities understand, pre-empt and respond to climate disinformation and coordinated online attacks that threaten public trust.
For the last decade, I have worked tirelessly to clean up London’s dangerous air. Today I’m targeting another form of toxicity polluting our lives: the malicious falsehoods of disinformation.
Mayor of London and C40 Co-Chair Sadiq Khan
By providing cities with tailored advice, monitoring and support, City Climate Facts will help leaders protect and advance climate policies that improve health, reduce costs and protect the environment.
Because if cities are to take bold climate action, they must earn and build public trust.
Mayoral parliament visit
Visiting one of London’s most iconic landmarks, mayors from around the world gathered at the Houses of Parliament for a guided tour.
Local leaders were shown the building’s most iconic sites, including the House of Commons, the House of Lords and the oldest building in the Houses of Parliament – Westminster Hall.
Setting the direction for city climate leadership
The C40 Steering Committee also met today to discuss our future strategy and help shape the direction of the C40 network.
Led by C40’s Co-Chair Mayor Sadiq Khan, the meeting highlighted the strength of city collaboration and mayoral cooperation.
Innovative thinking at LCAW
Today also marked the opening of Climate Action’s Climate Innovation Forum 2026.
Leaders from business, finance, policy and technology came together at #CIF26 to explore the partnerships and innovation needed to accelerate the transition to a net-zero economy.
Throughout the day, speakers including Selwin Hart, United Nations Special Adviser to the Secretary-General on Climate Action and Just Transition, and André Corrêa do Lago, COP30 President, highlighted the importance of scaling investment and deploying new technologies to turn climate commitments into real-world progress.
Building stronger climate narratives
Hosted by the C40 Centre, mayors gathered for the latest Mayoral Masterclass to exchange insights with each other.
The session focused on the power of narratives to build public support for climate action and explored how compelling, values-based narratives can help future-proof climate policies.
As LCAW26 gets underway, today demonstrated the strength of bringing leaders together for a shared purpose, and collaboration is essential in accelerating climate action.