Rt Rev Nicholas Holtam is the Church of England's lead bishop on environmental issues.
The summit is due to be held in Brisbane, Australia, from November 15-16th.
Bishop Nicholas said: "The Australian government, which as host has the power to set the agenda at the gathering of the world's biggest economies, has so far refused to make climate change a topic for discussion.
"For Christians, the Earth is God's creation and we are charged with caring for it as good stewards. Our failure to take care with our carbon emissions leave the world's poorest as the most vulnerable.
"Continued sea level rise could see countries like Tuvalu and the Marshall Islands wiped off the map entirely. Australia's neighbouring nations, the Pacific Islands, include most of those set to be hit hardest by climate change, as well as being among the poorest and least politically powerful.
"It is not good enough for the world's most powerful and polluting nations to stand idly by in that fight."
In September, tens of thousands of people marched in London for action on climate change.
It included figures such as singer Peter Gabriel, actress Emma Thompson, designer Vivienne Westwood and the Bishop of London, Rt Rev Richard Chartres.
The demonstration was one of more than 2,000 across the world.