A number of church services are taking place around the country where believers will be encouraged to pray on the first day of every month during 2015.
In December 2015 a new international climate agreement will be signed in Paris
Charities like Operation Noah, A Rocha, Christian Aid, Christian Concern for One World, Christian Ecology Link, OurVoices, Hope for the Future and Shrinking the Footprint are all involved.
The campaign is aiming to highlight the political and spiritual significance of prayer and fasting as a powerful platform for change.
Canon Giles Goddard, board member of Operation Noah said: "The need for change is urgent and everyone can help bring it about. This is an initiative about hope.
"Praying and fasting for the climate will inspire action and encourage people to think about what needs to happen.
"We are calling for justice for all those impacted by climate change now and in the future, and for an ambitious outcome at next year's climate talks in Paris. We hope people across the country will support the initiative and tell others about it."