Core Insights - The report emphasizes the increasing health challenges posed by extreme heat to global laborers, necessitating immediate action from governments, employers, and health departments to mitigate risks associated with heat stress [1][2] Group 1: Health Impact on Laborers - Climate change is causing more frequent and intense heatwaves, significantly affecting the health of laborers, particularly those in physically demanding sectors such as agriculture, construction, and fisheries [1][2] - For every 1°C increase in work environment temperatures above 20°C, labor productivity declines by 2% to 3% [1] Group 2: Recommendations and Guidelines - The new guidelines suggest tailoring heat protection plans based on local climate characteristics, specific job types, and the conditions of workers [2] - Special attention should be given to vulnerable groups, including older workers, those with chronic illnesses, and individuals with lower physical capacity [2] - Education and training for emergency responders, healthcare workers, employers, and laborers are crucial to enhance their ability to recognize and manage heat stress symptoms [2] Group 3: Global Labor Statistics - Over 2.4 billion workers are exposed to extreme heat conditions globally, leading to more than 22.85 million occupational injury incidents annually [2]

Core Insights - The summer of 2025 has been marked by extreme heat, with June being recorded as the "third hottest" June globally, with an average surface temperature of 16.46 degrees Celsius, 0.47 degrees higher than the average from 1991-2020 [2][4] - Europe experienced two significant heatwaves in June, with temperatures exceeding 40 degrees Celsius in some regions, particularly in Spain and Portugal, attributed to a persistent high-pressure system known as the "heat dome" [2][6] - The Mediterranean region recorded unprecedented sea surface temperatures, reaching an average of 27.0 degrees Celsius, which is 3.7 degrees above the average, exacerbating heat stress and impacting marine biodiversity [8] Temperature Trends - The global temperature from July 2024 to June 2025 was 0.67 degrees Celsius above the 1991-2020 average and 1.55 degrees Celsius above pre-industrial levels [4] - In Europe, the average land temperature for June was 18.46 degrees Celsius, 1.10 degrees higher than the 1991-2020 average, marking it as the "fifth hottest" June on record [4][7] - Japan reported its hottest June since records began in 1898, with an average temperature 2.34 degrees Celsius above the 1991-2020 average [6] Heat Stress and Health Impacts - Western and Central Europe faced extreme heat stress, with average temperatures reaching 20.49 degrees Celsius, surpassing the previous record set in 2003 [7] - The occurrence of "tropical nights," where temperatures remain above 20 degrees Celsius, increased significantly, leading to health risks associated with prolonged heat exposure [7] - The extreme heat conditions have heightened the risk of ozone air pollution and increased the likelihood of wildfires [9]