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London- Britain has pledged up to £720m ($1.13bn) on Thursday to a United Nations fund to help poor nations cope with global warming, the government said.
The contribution is equivalent to around 12% of the Green Climate Fund (GCF), whose total funds currently stand at around $9bn, based on pledges from 13 countries, it said.
At the weekend, the United States pledged $3bn and Japan promised $1.5bn. Germany and France have pledged $1bn each.
Britain's contribution will come from existing funds earmarked for international climate work.
High-level fund donors are meeting in Berlin on Thursday. The UN has set an informal target of raising $10bn this year.
Italy, Canada and Australia are among the major donors yet to announce pledges.
The cash is intended to help emerging economies curb their greenhouse gas emissions and adapt to changes such as heat waves, mudslides and rising sea levels, widely seen as vital to unlock a UN climate deal meant to be agreed in late 2015 in Paris.
The GCF is a major part of a 2009 plan to increase financial flows from public and private sources to help developing nations tackle climate change to $100bn a year by 2020.
