Japan's scorching summer has officially arrived, marking a significant shift in the country's climate narrative. The introduction of the term 'kokushobi' or 'cruelly hot day' by the Japan Meteorological Agency is a stark reminder of the changing times. As temperatures soar, the nation is grappling with the consequences, from health risks to agricultural challenges and cultural shifts. This extreme heat is not just a fleeting phenomenon but a harbinger of a hotter future, as evidenced by the alarming rise in heat-related deaths and the impact on staple crops like rice.
The heatwave has already claimed lives, with a man in his 40s succumbing to heatstroke in Sanjo, Niigata prefecture, and another in his 70s in Kanagawa, southwest of Tokyo. These tragic incidents highlight the very real dangers posed by extreme heat, especially for vulnerable populations. The fact that heatstroke deaths surpassed 2,000 in 2024 and over 100,000 people were hospitalized last year due to heat-related illnesses underscores the urgency of the situation. It's not just about the immediate health risks; the long-term implications for public health are profound.
The agricultural sector is also feeling the heat. Rice, a staple crop in Japan, is under threat due to the rising temperatures. Farmers are adapting by planting heat-tolerant varieties and even switching to crops like avocados, which have not traditionally been grown on a large scale in the country. This shift in agricultural practices is a testament to the resilience of Japanese farmers but also a sign of the challenges they face in a changing climate.
The impact of the heat is also being felt in sports. The koshien national high school baseball tournament, a hugely popular event, has been restructured to reduce the risk of heatstroke. The games are now split into morning and evening sessions, a practical solution to a growing problem. This change is not just about the safety of the players but also about the broader cultural implications of extreme heat, including the potential for heat-related injuries and deaths among spectators.
The cultural shift is also evident in the workplace. Office workers are being encouraged to wear shorts on hot summer days, a relaxation of Japan's traditionally buttoned-down corporate culture. This 'Cool Biz' initiative, which also includes recommendations for polo shirts, T-shirts, and trainers, is a response to the expected high temperatures and the 'challenging outlook for electricity supply'. It's a small but significant step towards a more adaptable and resilient corporate culture.
The study by the National Institute for Environmental Studies (NIES) and Tokyo's Waseda University in 2025 adds a layer of urgency to the situation. Without drastic cuts to greenhouse gas emissions, school sports will become unplayable outdoors by the 2060s. This finding is a stark reminder of the long-term consequences of climate change and the need for immediate action. The summer of 2025, which was 2.4C above the average of the previous three decades, set a new all-time Japanese high of 41.8C at Isesaki, Gunma, north of Tokyo, on 5 August.
In my opinion, the introduction of 'kokushobi' is a significant step in raising awareness about the dangers of extreme heat. However, it also underscores the need for more comprehensive climate action. The rising temperatures are not just a local issue; they are a global concern. The impact on Japan's agriculture, sports, and culture is a microcosm of the challenges facing societies worldwide. As we grapple with the consequences of a hotter future, it's crucial to remember that every degree of warming matters. The heat is not just a nuisance; it's a threat to human health, the environment, and the very fabric of our societies. It's time to take action, not just in Japan but globally, to mitigate the worst effects of climate change and ensure a sustainable future for generations to come.
