On Sunday, parishioners of St Mark's Anglican Church in Spotswood will join Christians all over Australia - and the world - in a national day of prayer and action on climate change.

The local 'Hope for Creation' event is the brainchild of Cathy Cook, who has a masters in theological ethics, specialising in ecology, from Edinburgh University.

After returning from Scotland two years ago, Ms Cook (pictured with daughter Aelwyn) said she felt compelled to put her studies to practical use. A self-described introvert, she was struck with the "seemingly crazy" idea of rallying Christians and congregations around Australia to unite in prayer for global change.

"I believe that humans have contributed significantly to the current warming of the Earth and that the warming is already having negative impacts on some of the poorest people in developing countries," Ms Cook said.

"I believe the Earth can be saved from the worst effects of climate change. Humans are largely responsible for what's happening, so it is only natural that we can work together to reduce our impact on the Earth and undo some of the damage we've done."

Christian activists in other countries have instigated their own Hope for Creation, with more than 6200 people in 40 countries signed up for the event.

Meteorologist Mick Pope, who co-ordinates the Ethos Environment think tank, will speak at the 10am service at St Mark's, 622 Melbourne Road, Spotswood.

Hope for Creation.