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UN agencies warn that extreme heat is a threat to global food systems

According to a report by the U.N. food and weather agencies, extreme heat is pushing the global agrifood system to the edge, and threatening livelihoods and the health of over a billion people.

Heatwaves are getting more intense and longer, causing damage to crops, livestock and fisheries.

Extreme heat changes the rules of what and when farmers, fishermen and foresters are allowed to grow. It can even dictate if people are able to work, said Kaveh Zaidi, the head of FAO's climate office.

"At its heart, this report tells us that we are facing a very uncertain tomorrow,"?he said.

Recent climate datasets indicate that global warming is increasing, and 2025 will be among the hottest years ever recorded, leading to a?increase in severe weather events.

Extreme heat increases the risk of droughts, pest outbreaks, and wildfires. It also reduces crop yields when critical temperature thresholds are exceeded.

As temperatures rise, the risks increase rapidly

According to the report, temperatures above 30 degrees Celsius (86 degree Fahrenheit) reduce yields of most major crops.

Zahedi gave the example of Morocco, where heatwaves followed six years' drought. This led to a 40% drop in cereal yields. The olive and citrus harvests were decimated. "These harvests were essentially a failure," he said.

Marine heatwaves also become more frequent. They deplete oxygen levels in the water and threaten fish stocks. The report stated that 91% of oceans around the world will experience at least one marine-related heatwave in 2024.

As warming accelerates, risks increase sharply. The report stated that the 'intensity' of extreme heat events will roughly double with 2 degrees Celsius warming and quadruple with 3 degrees.

Zahedi stated that every degree increase in global average temperatures reduces yields by approximately 6% for the four main crops of the world - maize (?rice), soya (soya beans), and wheat.

FAO and WMO stated that piecemeal response was?inadequate' and called for better governance of risk and early warning weather systems to assist farmers and fishermen in taking preventative action.

Zahedi stated that if you could get the data into the hands of farmers, they would be able to adjust their planting schedule, what they plant and when they harvest.

The report said that adaptation alone was not enough. It argued that the only solution to the increasing threat of extreme heat was ambitious and coordinated actions to curb climate changes. Crispian Balmer reported. Mark Potter edited the story.

(source: Reuters)