Japan's recent heatwave has brought a new term, 'kokushobi', to the forefront, marking a significant shift in the country's understanding of extreme heat. This phenomenon, where temperatures soar above 40 degrees Celsius, is not just a fleeting event but a growing concern. The Japan Meteorological Agency's introduction of this term is a stark reminder of the changing climate and its impact on daily life.
The heatwave has hit central Japan hard, with cities like Gujo and Tajimi in Gifu prefecture, along with Toyota in Aichi prefecture, recording all-time highs. The 40-degree mark, once a rare occurrence, is now a reality, and it's not just about breaking records. It's about the impact on people's lives and the environment.
One of the most concerning aspects is the rise in heat-related deaths. In 2024, heatstroke deaths surpassed 2,000, and over 100,000 people were hospitalized due to heat-related illnesses. This is not just a statistical increase; it's a human tragedy. The elderly are particularly vulnerable, as seen in the deaths of two men in their 40s and 70s in Niigata and Kanagawa prefectures, respectively.
The effects of this heatwave extend beyond human health. Agriculture is suffering, with rice yields and quality being affected. Farmers are adapting by planting heat-tolerant varieties and even switching to crops like avocados, which were not traditionally grown in Japan on a large scale. This shift in agricultural practices is a testament to the resilience of Japanese farmers but also highlights the need for more sustainable solutions.
The heatwave has also impacted sports, most notably the koshien national high school baseball tournament. To prevent heatstroke, the games are now split into morning and evening sessions. This is a practical response to a growing problem, but it also raises questions about the future of outdoor sports in a warming world.
In the corporate world, Japan is taking a more relaxed approach. The 'Cool Biz' initiative encourages office workers to wear shorts and short-sleeved shirts on hot days to reduce electricity consumption. This is a welcome change in a traditionally buttoned-down culture, but it also highlights the need for more comprehensive solutions to the energy crisis.
The study by the National Institute for Environmental Studies (NIES) and Waseda University in 2025 is a wake-up call. It predicts that without drastic cuts to greenhouse gas emissions, school sports will become unplayable outdoors by the 2060s. This is not just a prediction; it's a warning. The future of sports and outdoor activities in Japan is at stake.
The summer of 2025 was particularly severe, with temperatures 2.4C above the average of the previous three decades. The all-time high of 41.8C at Isesaki, Gunma, is a stark reminder of the changing climate. Japan's average summer temperatures have risen about 1.3C over the past 100 years, and the trend is not showing any signs of slowing down.
In conclusion, Japan's first 'kokushobi' day is a call to action. It's a reminder that the impacts of climate change are not just theoretical but very real and very dangerous. The country's response, from agricultural adaptations to relaxed corporate culture, is a step in the right direction, but more needs to be done. The future of Japan, and the world, depends on how we respond to this growing crisis.
