Overview

• A study by World Weather Attribution, Climate Central and the Red Cross Climate Centre found nearly 4 billion people experienced at least 30 additional days of extreme heat between May 2024 and May 2025.
• The World Meteorological Organization and the UK Met Office project an 86 percent chance that global mean temperatures will exceed 1.5°C above preindustrial levels for at least one year between 2025 and 2029.
• Global temperatures surpassed the 1.5°C threshold for the first time in 2024 and there is an 80 percent likelihood that a year between 2025 and 2029 will break that record.
• Low-income communities, older adults and other vulnerable groups face disproportionate health risks as heatwaves become longer and more severe.
• Experts warn that without rapid cuts to fossil fuel emissions, economic losses and damage to infrastructure will intensify alongside rising temperatures.