There is increasing scientific evidence supporting the link between extreme heat, heatstroke, and adverse health risks in the US.  Exposure to heat may result in more severe health risks or death because it exacerbates pre-existing medical conditions, including cerebral, respiratory, and cardiovascular diseases.  Conversely, emerging evidence shows that individuals with pre-existing or chronic illnesses are more susceptible to developing heatstroke and experiencing severe outcomes.

A continued surge in emergency transports for heatstroke during the brief period from July to August is anticipated in Japan. When combined with conditions such as high humidity, sun exposure, stagnant air, and poor air quality, high temperatures can become a health concerns.  Heatstroke may become severe and even fatal, particularly depending on factors such as age, occupation, and the presence of pre-existing or chronic medical conditions.  Extreme heat events (≥35°C) are expected to become more frequent and more intense in the future.  Heatwaves can affect many populations over a short period of time, which may overwhelm healthcare and emergency response capacity.

The global warming we are facing poses a problem not only because of the changes it brings, but also because of the unprecedented speed at which these changes are occurring.  The broader and faster the climate shifts, the more significant the potential adverse impacts on society and the economy.

This report underscores the urgent need for immediate and comprehensive policy responses to the health risks posed by global warming— now referred to as ‘global boiling’.  Climate change exerts significant influence on public health, energy systems, and land use planning. Strengthening adaptation and resilience is imperative to mitigate the future risks.