Cities100 is filled to the brim with successful solutions showing that cities are taking action on climate change on a global scale. Regardless of wealth or resources, size or location, cities around the world are learning from one another, adapting global best practices to fit local circumstances, and demonstrating that we have the power to take action to build a smarter, more resilient, and resource-efficient world. In the lead up to COP21 this publication is igniting hope that results are possible and action is happening. We hope it will inspire the political discussions.

The publication is a collaboration between C40, Realdania and Sustainia and you can read, download and share it here for free!


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Selection Process

The Cities100 publication highlights cities that have implemented outstanding projects, programmes, policies and practices to combat climate change and reduce climate risks. The application process for the Cities100 was conducted together with the C40 Cities Awards. All details about the application process can be found in the Application Guide.

Each application for the Cities100 is evaluated by the C40 and Sustainia urban professionals. Please read the Terms and Conditions for applying for the C40 Cities Awards and the Cities100.

All applicants for Cities100 and C40 Cities Awards will be notified about the selection of projects in the first week of October.


The solutions highlighted in the Cities100 are divided into 10 sectors:

  1. Carbon Measurement & Planning
  2. Adaptation Planning & Assessment
  3. Building Energy Efficiency
  4. Green Energy
  5. Finance & Economic Development
  6. Solid Waste
  7. Adaptation Implementation
  8. Smart Cities & Smart Community Engagement
  9. Sustainable Communities
  10. Transportation


C40 Cities Awards logoC40 and Sustainia have partnered to create a new publication the “Cities100” which seeks to identify, connect, and communicate the most ground-breaking solutions to the problems of climate change that afflict cities today. The Cities100 will serve as a guide to policies, programmes and projects that create the resilient and productive urban environments of the future. Applications that are submitted for the C40 Cities Awards will automatically be entered as a Cities100 application also, providing cities with a chance for projects to be highlighted and recognised across two platforms.


Please get in touch with the Cities100 Project Manager if you have questions about the project:
Esben Alslund-Lanthén


Mayors continue to deliver important, innovative policies and programmes that reduce greenhouse gas emissions and improve resiliency. Launched in 2013, the formally known ‘City Climate Leadership Awards’ were created to recognise those successes, catalyze ambition, and share best practices with cities around the world. The 2015 newly named ‘C40 Cities Awards’ took place on the evening of December 3rd 2015 in Paris , to coincide the activities around COP21, and aimed to share highly replicable ‘best practices’ across cities and draw attention to outstanding performances that have achieved a high level of environmental success in a challenging context.


Please contact the C40 Cities Awards Project Manager if you have questions about the project:
Emily Briday