Only 35% of $600 million needed for humanitarian operations in Afghanistan is provided by international donors, despite promises made in Geneva.
The war in Tigray was the subject of an informal closed meeting of the UN Security Council where aid chief Mark Lowcock warned that over 350,000 people were in famine conditions.
Wealthy nations will have less food security as developing nations cut back on food exports.
African nations have for years called for more money from rich countries to help them combat global warming and integrate climate risks into their long-term economic planning - and that plea will be heard in New York again this week.
The UN humanitarian chief says the conflict in Yemen has left 11 million people dependent on emergency food assistance and 75 percent of its 22 million people require some form of aid.
Low and erratic rains caused by the El Nino since 2012 keep lands dry and produce poor harvests.
About 100,000 people face immediate starvation, with millions more on the brink of famine. The UN warns that nearly half of South Sudan's population will be without food by July if no action is taken.
According to the UN, tens of thousands of children in northeast Nigeria will die of malnutrition this year unless they receive treatment soon
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