(Bloomberg) — The U.S. is among at least 12 countries that have yet to cough up money promised for a United Nations fund to help developing economies cope with climate change.

Only $4 billion of the $10.2 billion pledged to the Green Climate Fund has been delivered as signed contributions, short of the $4.7 billion targeted before operations start, its Executive Director Hela Cheikhrouhou said. The U.S. has yet to fulfill its $3 billion pledge.

The contributions are "not sufficient" as of the Thursday deadline, which nations agreed to when they promised the money, Cheikhrouhou said in a call with reporters. While European Union member states committed $3.7 billion of the $4.7 billion they pledged, she said.

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