Stop Climate Chaos members' include Christian Aid, Friends of the Earth, Greenpeace, Oxfam, RSPB, Unison, The Wildlife Trust, National Federation of Women's Institutes and the World Wildlife Fund.
The public can sign up to the campaign via text message or by logging onto the campaign website www.icount.org.uk.
Brand and strategy agency Provokateur will be working with the coalition on further marketing activity leading up to an event to be held in Trafalgar Square on November 4.
Celebrity supporters will attend the event to highlight the need for climate change. A pre-recorded message of support from Sir David Attenborough will also be shown and a live counter clocking up the numbers of those who have registered their support will be on display.
Ashok Sinha, director of Stop Climate Chaos, said: "Whether you're a gardener suffering with unpredictable weather, a parent worried for your child's future, someone concerned about drought and famine in Africa or a nature-lover watching our native species disappear, 'I Count' is an opportunity for us all to come together and make our voices heard."
The timing is prior to the next climate change negotiations in Nairobi, Kenya, on November 6. The "I Count" campaign aims to lobby the UK government to assist developing countries to adapt to climate change and reduce greenhouse gas emissions.
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