Half way through the UN climate summit in Copenhagen and after a week in which no breakthrough was achieved, ecumenical leaders have asked negotiators to be more ambitious.

World Council of Churches (WCC) general secretary the Rev Dr Samuel Kobia called on climate negotiators "to work for a legally binding, ambitious and fair deal".

"It is clear", Kobia said, "that the level of ambition must be drastically increased."

He expressed hope that as the climate summit enters its second and last week, "substantive progress" is achieved in regard to targets for the reduction of carbon dioxide (CO2) emissions, measures to face the consequences of climate change and financial mechanisms to fund them.

Kobia was speaking on behalf of church leaders from a broad international network of faith-based stakeholders following the Copenhagen negotiations at an informal dinner attended by parties of the UN Framework Convention on Climate Change.

The faith-based network under the umbrella of the WCC and related organisations has brought some 350 delegates to the UN climate summit in Copenhagen. They advocate for "reaching the target of maximum 2 degrees temperature rise [above contemporary averages], or preferably 1,5 degree as proposed by many parties", Kobia said.

For this to happen, CO2 "emissions cuts of 25 to 40 per cent by 2020 in relation to the 1990 levels must be ensured and it is in the interest of all parties that this is accomplished without loop holes which may erode the effects of any agreement", he added.

Given the "difference in capacity and historic responsibility related to climate change", said Kobia, developing countries need "substantial financial and technological support to be able to maintain their possibility for economic development".

Climate change negotiations are "about equity, justice and the equal right to development". So any agreement "must be based on these principles, as any alternative will only emphasise the existing divides between rich and poor in the world", Kobia concluded.