This leaves it short of the threshold to start funding projects to curb dangerous climate change, GCF executive director Hela Cheikhrouhou told journalists by teleconference from Songdo, South Korea.
"The fund has successfully signed agreements for close to USD 4 billion from 21 countries, representing 42 per cent of the amount (USd 9.3 billion) pledged at our pledging conference in Berlin" last November, she said.
The 30-odd funder nations had agreed that 50 per cent of the USD 9.3 billion Berlin pledges should be converted into "contribution agreements", with timetables for payment, by close of business today.
The figure achieved was "not sufficient," she said, and urged "all remaining contributors to turn their pledges into signed agreements at their earliest opportunity."
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Countries that have not signed include the United States, which had pledged USD 3 billion, Japan (USD 1.5 billion), Canada (USD 277 million) and Australia (USD 187 million), said a GCF document.
The fund was created after developed countries agreed at a UN climate summit in Copenhagen in 2009 to mobilise USD 100 billion annually by 2020 for climate aid to developing countries.
Disbursement of the money will help poor nations adopt less-polluting technologies to limit further climate damage, while bolstering their defences against problems that can no longer be avoided.
Cheikhrouhou underlined that funding the GCF was also key to creating political goodwill in negotiations meant to conclude in Paris in December with a world pact on curbing Earth-warming greenhouse gas emissions.
"A fair agreement in Paris must include clear language on the fund's role in channelling increasing amounts of new climate finance to developing countries," she said.