* Group of 20 divided on push to reach climate finance deal

* Agreement needed before key Copenhagen summit in Dec

* Meeting also seeking progress on balanced growth scheme

By Toni Vorobyova and Anna Willard

ST ANDREWS, Scotland, Nov 7 (Reuters) - British finance minister Alistair Darling urged his G20 counterparts on Saturday to work toward a $100 billion deal on tackling climate change as developing nations held firm they did not want to talk about it.

Darling is hosting the third meeting of Group of 20 finance ministers and central bankers this year in St Andrews, Scotland, to discuss the progress of the global economy and come up with a framework to ensure future crises did not happen.

Britain is also determined to push forward on an ambitious target to meet the costs of climate change by 2020 ahead of a major environmental summit in Copenhagen next month.

"I think it really is imperative that when we reach the end of the day that we have shown that we have made some real progress," Darling said at the start of talks on Saturday.