The number of people hit by climate-related disasters is expected to rise by about 50%, to reach 375m a year by 2015, the UK-based charity Oxfam says.
Current humanitarian systems are barely able to cope, an Oxfam study contends.
It warns agencies are in danger of being overwhelmed by events such as flooding, storms and drought.
The group called for a radical shift so that humanitarian aid is sent impartially, instead of on the basis of political or other preferences.
Oxfam’s Rob Bailey told the BBC a big increase was needed in aid spending, but that the problem was not just about the amount of money.
“We need to see that money spent in better ways,” he said.
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