Japan Sees Hottest September Since Records Began 

Young women use portable fans to seek relief from the heat as temperatures soar in Japan. (AFP)
Young women use portable fans to seek relief from the heat as temperatures soar in Japan. (AFP)
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Japan Sees Hottest September Since Records Began 

Young women use portable fans to seek relief from the heat as temperatures soar in Japan. (AFP)
Young women use portable fans to seek relief from the heat as temperatures soar in Japan. (AFP)

Japan has seen its hottest September since records began 125 years ago, the weather agency said, in a year expected to be the warmest in human history.

The scorching September's average temperature was 2.66 degrees Celsius higher than usual, the Japan Meteorological Agency said on Monday.

This was "the highest figure since the start of statistics in 1898", the agency said in a statement.

This year is expected to be the hottest in human history as climate change accelerates, with countries including Austria, France, Germany, Poland and Switzerland each announcing their warmest September on record.

Across Japan last month, 100 of 153 observation locations broke an average temperature record, including in Tokyo, with an all-time high of 26.7 degrees Celsius (80 degrees Fahrenheit), in Osaka with 27.9C and in Nagoya with 27.3C.

The average temperature jump of 2.66C was "extraordinary" and "easily topped previous highs", weather agency official Masayuki Hirai told AFP on Tuesday.

"If this is not an abnormally high temperature, I don't know what is," he said.

French weather authority Meteo-France said the September temperature average in the country will be around 21.5 degrees Celsius, between 3.5C and 3.6C above the 1991-2020 reference period.

The UK, too, has matched its record for the warmest September since records began in 1884.

The average global temperature in June, July and August was 16.77 degrees Celsius, surpassing the previous 2019 record, the European Union's Copernicus Climate Change Service (C3S) said in a report.

In September, UN Secretary-General Antonio Guterres told world leaders the climate crisis had "opened the gates to hell".

In his opening address at the Climate Ambition Summit, Guterres evoked this year's "horrendous heat" but stressed: "We can still limit the rise in global temperature to 1.5 degrees," referring to the target seen as needed to avoid long-term climate catastrophe.



Scientists in Japan Develop Plastic that Dissolves in Seawater within Hours 

A researcher shows a sample of ocean-degradable plastic at the Center for Emergent Matter Science (CEMS) of Japanese research institution Riken in Wako, Saitama Prefecture, Japan May 27, 2025. (Reuters) 
A researcher shows a sample of ocean-degradable plastic at the Center for Emergent Matter Science (CEMS) of Japanese research institution Riken in Wako, Saitama Prefecture, Japan May 27, 2025. (Reuters) 
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Scientists in Japan Develop Plastic that Dissolves in Seawater within Hours 

A researcher shows a sample of ocean-degradable plastic at the Center for Emergent Matter Science (CEMS) of Japanese research institution Riken in Wako, Saitama Prefecture, Japan May 27, 2025. (Reuters) 
A researcher shows a sample of ocean-degradable plastic at the Center for Emergent Matter Science (CEMS) of Japanese research institution Riken in Wako, Saitama Prefecture, Japan May 27, 2025. (Reuters) 

Researchers in Japan have developed a plastic that dissolves in seawater within hours, offering up a potential solution for a modern-day scourge polluting oceans and harming wildlife.

While scientists have long experimented with biodegradable plastics, researchers from the RIKEN Center for Emergent Matter Science and the University of Tokyo say their new material breaks down much more quickly and leaves no residual trace.

At a lab in Wako city near Tokyo, the team demonstrated a small piece of plastic vanishing in a container of salt water after it was stirred up for about an hour.

While the team has not yet detailed any plans for commercialization, project lead Takuzo Aida said their research has attracted significant interest, including from those in the packaging sector.

Scientists worldwide are racing to develop innovative solutions to the growing plastic waste crisis, an effort championed by awareness campaigns such as World Environment Day taking place on June 5.

Plastic pollution is set to triple by 2040, the UN Environment Program has predicted, adding 23-37 million metric tons of waste into the world's oceans each year.

"Children cannot choose the planet they will live on. It is our duty as scientists to ensure that we leave them with best possible environment," Aida said.

Aida said the new material is as strong as petroleum-based plastics, but breaks down into its original components when exposed to salt. Those components can then be further processed by naturally occurring bacteria, thereby avoiding generating microplastics that can harm aquatic life and enter the food chain. As salt is also present in soil, a piece about five centimeters (two inches) in size disintegrates on land after over 200 hours, he added.

The material can be used like regular plastic when coated, and the team are focusing their current research on the best coating methods, Aida said. The plastic is non-toxic, non-flammable, and does not emit carbon dioxide, he added.