Hopenhagen is a climate change campaign organized by the United Nations

United Nations

The United Nations is an international organization whose stated aims are facilitating cooperation in international law, international security, economic development, social progress, human rights, and achievement of world peace...

 and the International Advertising Association

International Advertising Association

The International Advertising Association is a marketing communications organization founded in 1938. The IAA is an international organization with a global network including 4,000 members and 56 Chapters, within 76 countries.The focus of the IAA is to:...

 to support COP15, — the United Nations Climate Change Conference 2009.
The creative council was chaired by Bob Isherwood

Bob Isherwood

Bob Isherwood is an Australian businessman, noted for his role as the Worldwide Creative Director of Saatchi & Saatchi from 1996 until he resigned in November 2008. He cited as his reason for resigning that, after helping reinvent the company, he needed to reinvent himself...

 and the ad agencies that created the campaign included Ogilvy & Mather

Ogilvy & Mather

Ogilvy & Mather is an international advertising, marketing and public relations agency based in Manhattan and owned by the WPP Group. The company operates 497 offices in 125 countries with approximately 16,000 employees.-History:...

, Euro RSCG

Euro RSCG

Euro RSCG Worldwide is one of the largest integrated marketing communications agencies in the world, made up of 233 offices located in 75 countries throughout Europe, North America, Latin America, Asia Pacific and the Middle East. Euro RSCG provides advertising, marketing services, corporate...

, McCann Worldgroup, Draftfcb, Saatchi & Saatchi

Saatchi & Saatchi

Saatchi & Saatchi is a global advertising agency network with 140 offices in 80 countries and over 6,500 staff. It was founded in London in 1970 but now headquartered in New York. The parent company of the agency group was known as Saatchi & Saatchi PLC from 1976 to 1994, was listed on the London...

, Interbrand

Interbrand

Interbrand, a division of Omnicom, is a global branding consultancy, specializing in vast brand services, including brand analytics, brand strategy, brand valuation, corporate design, digital brand management, and naming...

, Tribal DDB

Tribal DDB

Tribal DDB is a worldwide network of interactive agencies, established in 2000, when the advertising giant DDB integrated all its interactive-web properties under the Tribal brand....

 and Digitas

Digitas

Digitas is an integrated advertising agency and a member of the Publicis Groupe. The company currently has over 3,000 employees in 32 offices in 19 countries. Digitas also owns The Third Act: , Digitas Health, , Prodigious Worldwide and Solutions | Digitas...

.
The campaign runs the web site http://www.hopenhagen.org/ where users can sign a petition.
Together with Huffington Post it also included sponsoring of a "Hopenhagen Ambassador", — a citizen journalist selected in a contest.

Renowned photographer John Clang

John Clang

John Clang is a photographer/visual artist. He was born in Singapore in 1973, and lives and works in New York and Singapore. Clang’s work is exhibited in galleries and museums worldwide...

 has joined the global Hopenhagen effort with a beautiful stop-motion short film he created to bring awareness to the 2009 United Nations Climate Change Conference

2009 United Nations Climate Change Conference

The 2009 United Nations Climate Change Conference, commonly known as the Copenhagen Summit, was held at the Bella Center in Copenhagen, Denmark, between 7 December and 18 December. The conference included the 15th Conference of the Parties to the United Nations Framework Convention on Climate...

. In addition to the film, Clang shot and created a series of posters that bring to life the visual representation of Hopenhagen’s citizens.