Thirty nations meeting in Berlin have pledged $9.3bn (£6bn) for a fund to help developing countries cut emissions and prepare for climate change.
The Green Climate Fund was to have held at least $10bn by the end of 2014, so the pledge is just shy of the target.
The South Korea-based fund aims to help nations invest in clean energy and green technology.
It is also designed to help them build up defences against rising seas and worsening storms, floods and droughts.
Rich nations previously vowed that by 2020, developing countries would get $100bn (£64bn) a year from such a fund.
The US had already pledged $3bn and Japan $1.5bn. The UK, Germany and France have promised about $1bn each, and Sweden more than $500m million.
Smaller amounts were offered by countries including Switzerland, South Korea, the Netherlands, Denmark, Norway, Mexico, Luxembourg and the Czech Republic.
After co-hosting the donors’ conference, German Environment Minister Gerd Mueller hailed the achievement, saying humanity must fight climate change so “it doesn’t go the way of the dinosaurs”.
Hela Cheikhrouhou, the fund’s executive director, described the pledges as “game-changing”, and said the money would be spent equally on climate change adaptation and mitigation, especially for the most vulnerable nations.
These include small island nations and Africa’s poorest countries.
The fund was agreed because developed nations have caused the majority of global warming so far – and their CO2 emissions stay in the atmosphere for 100 years. Poor countries asked for help to adapt to climate change they have not caused.
But as greenhouse gas emissions are a global problem, rich nations acknowledge a degree of self-interest in helping developing countries to invest in clean technology.
Ms Cheikhrouhou said raising the billions had created “renewed trust and enthusiasm” ahead of international talks in Peru next month, and in France a year later, on slashing worldwide carbon emissions.
are you scared yet?..if you dont send money to the GCF we will end up like dinosaurs!..now that is the epitome of alarmism..this fund should have had $100bn in from 2 years ago..its had zero until the very late push to start filling it leading up to cop21 in 2015..the usa putting in $3bn is chicken feed..this is a country that owes $17 trillion!..and the UN dont want $100bn in total ..they want $100bn every year..year after year after year..the fund sits in south korea..home of wanki moon..how convenient..then they can play father christmas and hand out money to the the big end of town to blow on “green ideas” and ventures when all that people want in 3rd world countries is cheap energy, shelter, food and water..