An international appeal has begun to raise €160 million for Pakistan, after weeks of heavy rain.
The United Nations says the nation's dealing with a "monsoon on steroids".
More than 1100 people have died, while millions have lost their homes.
The country says richer nations have a duty to help as they caused climate change.
Foreign minister Bilawal Bhutto Zardari says the country has been dealing with difficult conditions for months.
