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Global climate indicators show faster human-driven warming
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The fourth edition of the Indicators of Global Climate Change ( IGCC ) report for 2025, prepared by an international team of more than 70 scientists, sets out an overview of a climate crisis that is worsening rapidly and continuously, attributing the changes to human activity.
Key facts
- In 2025, human-induced warming reached 1.37°C above pre-industrial levels.
- Carbon dioxide in particular rose to 425.6 parts per million (ppm), up 3.8% from 2019, showing that these gases are trapping more heat in the atmosphere.
- The figure is consistent with actual measurements of global surface temperature, which found 2025 was the third-hottest year on record, with natural variability playing only a small role.
- During 2016–2025, the rate of warming caused by human activity remained at a record high of 0.27°C per decade.
- Scientists warned that, if this trend continues, the world will cross the Paris Agreement ’s key 1.5°C threshold around 2030, or in about four years, earlier than many had expected.
- The report said global greenhouse gas emissions reached a record high of 56.8 billion tonnes of carbon dioxide equivalent in 2024, driven mainly by fossil-fuel combustion.
Summary
In 2025, human-induced warming reached 1.37°C above pre-industrial levels.
The figure is consistent with actual measurements of global surface temperature, which found 2025 was the third-hottest year on record, with natural variability playing only a small role.