Organisers say I Count will run for four years and will mix the "personal and political" by encouraging individuals to reduce their own carbon counts and building a political mandate to persuade governments to take action on global warming.
The aims of the campaign include achieving an irreversible decline in global greenhouse gas emissions by 2015, reducing UK emissions by 3 per cent a year and pledging assistance to developing countries to adapt to climate change.
"I Count will tackle the view that climate change is too big a problem to fix," said Ashok Sinha, director of Stop Climate Chaos. "We need to act now. The science is proven and research tells us the public are concerned, so we must now focus on solutions. We urge everyone to join us and tell the Government to take the urgent action required."
Early campaign activities will include a mass gathering of supporters in Trafalgar Square on 4 November and the publication of I Count: Your Step-by-step Guide to Climate Bliss, which will be published by Penguin.
An opinion poll will also be published, outlining public attitudes to climate change and what they expect politicians to do on the issue.
About 35 organisations have now joined the coalition, including Friends of the Earth, Christian Aid and the RSPB.
I Count can call upon the expertise of two Make Poverty History veterans: communications director Beth Tegg and director Sinha. But the campaign has no plans to imitate the iconic MPH wristband and claims it is assembling a more diverse range of organisations.