China warns of 'severe' threat to harvest from worst heatwave on record

China's autumn harvest is under "severe threat" from high temperatures and drought, authorities have warned, urging action to protect crops in the face of the country's hottest summer on record.

The world's second-largest economy has been hit by record temperatures, flash floods and droughts this summer -- phenomena that scientists have warned are becoming more frequent and intense due to climate change.

Southern China has recorded its longest sustained period of high temperatures and sparse rain since records began more than 60 years ago, the agriculture ministry said.

Four government departments issued a notice on Tuesday urging the conservation of "every unit of water" to protect crops.

"The rapid development of drought superimposed with high temperatures and heat damage has caused a severe threat to autumn crop production," the statement said.

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China produces more than 95 percent of the rice, wheat and maize it consumes, but a reduced harvest could mean increased demand for imports in the world's most populous nation -- putting further pressure on global supply already strained by the conflict in Ukraine.

Temperatures as high as 45 degrees Celsius (113 degrees Fahrenheit) have led multiple Chinese provinces to impose power cuts, as cities struggle to cope with a surge in demand for electricity that is partly driven by people cranking up the air conditioning to cope with the heat.

The megacities of Shanghai and Chongqing have cut outdoor decorative lighting, while authorities in Sichuan province have imposed industrial power cuts after water levels dropped at key hydroelectric plants.

More than 1,500 people were moved out of the area surrounding Chongqing on Monday after hot and dry conditions sparked multiple wildfires, according to state news agency Xinhua.

The searing heat is also drying up the critical Yangtze River, with water flow on its main trunk about 50 percent lower than the average over the last five years, state media outlet China News Service reported last week.

'Worst heatwave ever'

The national meteorological service renewed its warnings for drought and high temperatures on Tuesday, calling for 11 provincial governments to activate emergency responses.

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Authorities have already turned to cloud seeding -- a method to induce rainfall -- in parts of the country.

State broadcaster CCTV published footage this month showing meteorological staff shooting catalyst rockets into the sky and firefighters transporting water to farmers in need.

"This is the worst heatwave ever recorded," climate and energy expert Liu Junyan of Greenpeace East Asia told AFP.

"Climate science shows extreme heat is becoming exponentially worse," she said.

"So it's more likely that next year will have record-breaking heat."

This year's extreme weather is raising public awareness of climate change in China, with state media "now coming around to covering climate impacts" with unprecedented urgency, Liu said.

China has experienced three other episodes of intense heat so far this century -- in 2003, 2013, 2017.

The gap between heatwaves is "significantly shortening", Zhou said.