UN Secretary-General Antonio Guterres has appealed to the world to help Pakistan after arriving in the country to see for himself the flooding devastation that has left half a million people living in tents under the open sky.

Mr Guterres’s trip comes less than two weeks after he appealed for 160 million dollars (£139 million) in emergency funding to help those affected by the record monsoon rains and floods that have caused at least 10 billion dollars (£8.6 billion) in damages and 1,391 deaths in Pakistan.

International aid is arriving, including the first planeload of what the US has pledged will be 30 million dollars (£26 million) in assistance.

“I have arrived in Pakistan to express my deep solidarity with the Pakistani people after the devastating floods here. I appeal for massive support from the international community as Pakistan responds to this climate catastrophe,” Mr Guterres said on Twitter before dawn.

Last week, the UN chief issued a stern warning about the effects of climate change.

“Let’s stop sleepwalking toward the destruction of our planet by climate change,” he said in a video message to a ceremony in Islamabad at the time.

“Today, it’s Pakistan. Tomorrow, it could be your country.”

Pakistan Floods
Temporary housing is constructed for flood victims, in the Larkana District, of Sindh (AP)

Pakistan’s information minister Maryam Aurangzeb in a statement thanked the UN chief for visiting Pakistan at a time when, she said, one-third of Pakistan is underwater. She said she wants the visit to help elevate the crisis for flood victims to the global level.

“The visit will also help in realizing the consequences of the deadly effects of climate change,” she said, urging the international community to step up efforts to help poor countries affected by floods and natural disasters.

Ms Aurangzeb said Mr Guterres will receive a briefing from Pakistani officials about damages caused by floods before addressing a news conference along with Prime Minister Shahbaz Sharif in Islamabad.

So far, UN agencies and several countries have sent nearly 60 planeloads of aid, and authorities say the United Arab Emirates is one of the most generous contributors, as it has sent so far 26 flights carrying aid or flood victims.

Pakistan Floods
A displaced girl due to flooding from monsoon rains at a temporary tent housing camp for flood victims organized by the Chinese government, in Sukkur, Pakistan (AP)

The floods have touched all of Pakistan and affected more than 3.3 million people. Heritages sites have also been damaged, including Mohenjo Daro, considered one of the best-preserved ancient urban settlements in South Asia.

The ruins near the Indus River were discovered in 1922 and to this day, mystery surrounds the disappearance of the civilization that dates back 4,500 years, coinciding with those of ancient Egypt and Mesopotamia.

Mohenjo Daro is a Unesco World Heritage Site, and the UN heritage agency on Thursday announced an emergency amount of 350,000 dollars (£304,000) to help recover flood-damaged cultural heritage sites.

Mr Guterres was received on his arrival by deputy foreign minister Hina Rabbani Khar and will meet with Prime Minister Sharif and other government and military officials on his visit.

Since June, heavy rains and floods have added new burdens to cash-strapped Pakistan and highlighted the disproportionate effect of climate change on impoverished populations.

Experts say Pakistan is responsible for only 0.4% of the world’s historic emissions blamed for climate change. The US is responsible for 21.5%, China for 16.5% and the EU 15%.

The floods in Pakistan have also injured 12,722 people, destroyed thousands of miles of roads, toppled bridges and damaged schools and hospitals, according to the National Disaster Management Agency.