Changing Planet

C40 & Advertising Partners Launch Global Pro Bono Digital Ad Campaign to Showcase City Leadership

Today, C40 launched #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 include Clear Channel Outdoor (CCO)International Advertising Association (IAA) and DM9 Jayme SyFu (DM9).

“As mayors, our primary focus is on making our cities the most sustainable, prosperous places for our citizens to live and work, which doesn’t leave much time to broadcast to the world what we’re able to achieve,” said C40 Chair and Rio de Janeiro Mayor Eduardo Paes. “On behalf of all C40 mayors, I want to offer deep gratitude to CCO, IAA and DM9 for making this invaluable campaign possible. We know cities are key – now the world will, too.”

In addition to the #CitiesAreKey campaign launch on the Grand Screen at Cannes Lion, the campaign will also include videos highlighting C40 city solutions broadcast to hundreds of thousands of pedestrians and vehicles from a digital billboard in New York City’s iconic Times Square during Climate Week NYC.

For updates about the campaign, follow the hashtag #CitiesAreKey and follow @c40cities@CCOutdoorNA@IAA_Global and @dm9js on Twitter. Additional campaign elements can be found on C40’s FacebookInstagramLinkedIn and YouTube pages.

The ad can be found here and here.

To read the full press release, click here.

The C40 Cities Climate Leadership Group (C40) is a network of large and engaged cities from around the world committed to implementing meaningful and sustainable climate-related actions locally that will help address climate change globally. Recognizing that cities consume over two-thirds of the world’s energy and account for more than 70% of global CO2 emissions, our organization’s global field staff works with city governments, supported by our technical experts across a range of program areas to reduce carbon emissions and increase energy efficiency in large cities across the world. The current chair of the C40 is Rio de Janeiro Mayor Eduardo Paes, and 108th Mayor of New York City Michael R. Bloomberg is President of the Board. The Steering Committee includes: Berlin, Buenos Aires, Copenhagen, Hong Kong, Houston, Jakarta, Johannesburg, London, Los Angeles, Rio de Janeiro, Seoul and Tokyo.

About the Blog

Researchers, conservationists, and others share stories, insights and ideas about Our Changing Planet, Wildlife & Wild Spaces, and The Human Journey. More than 50,000 comments have been added to 10,000 posts. Explore the list alongside to dive deeper into some of the most popular categories of the National Geographic Society’s conversation platform Voices.

Opinions are those of the blogger and/or the blogger’s organization, and not necessarily those of the National Geographic Society. Posters of blogs and comments are required to observe National Geographic’s community rules and other terms of service.

Voices director: David Braun (

Social Media