They are calling on governments to strengthen incentives for renewable energy and are asking everyone to switch to a low carbon way of life in order to deliver the targets set at the Paris Climate summit.
The Church in Wales' environment group, CHASE, is behind the New Year suggestion and although it welcomes the Paris agreement, it is warning that countries and individuals now have to step up to make real change.
The Bishop of Swansea and Brecon, John Davies, who is also CHASE spokesperson, said, "We welcome the chance that the Paris agreement offers for the world to avoid dangerous climate change.
"The question now is whether the initiative that the Paris agreement offers will be seized. Will all countries - including Wales and the UK - deliver the necessary cuts in emissions?
"All of us have our part to play, and all parts of society need to strive to achieve the big transition to a low carbon way of life.
"The Church in Wales is developing its own action plan.
"The UK Government and the Welsh Government have a responsibility to lead and create the right incentives, and so I must express concern that the UK Government has recently announced cuts in its support for renewable energy and carbon capture and storage.
"It is hard to see how this is right given the scale and speed of the transition we need to make to a low carbon society. I hope that the UK Government will think again and strengthen its incentives for renewable energy and carbon capture so that the Paris agreement can be delivered."
Bishop John Davies
In September 2015, the Church in Wales recognised climate change is one of the key challenges facing humanity and began developing a church action plan to tackle the issue.
In December in Paris ministers from more than 190 countries formally agreed on the legally-binding deal on climate change.
The pact resolves to keep global warming below two degrees Celsius, and aims to keep it below 1.5 degrees.
If the target is met, it is hoped the worst effects of climate change, such as sea levels rising to the point where whole pieces of land are overtaken, can be averted.
