The planet is running a fever, and we are still adding heat.
The last eleven years are the warmest on record. The climate problem is no longer a warning about an imagined future.
Bad outcome probability
The global mean surface temperature for calendar year 2026 will be at least 1.3°C above the 1850–1900 reference average.
Climate change used to be described in the future tense. That grammar is becoming harder to defend. The World Meteorological Organization reports that the years 2015 through 2025 were the eleven hottest on record. The average global temperature in 2025 was about 1.43°C above the 1850–1900 reference level.
Behind the number is a planetary accumulation of energy. The ocean absorbs vast amounts of excess heat, and glaciers and sea ice respond over time. The WMO reports record-high ocean heat content in 2025 and warns that some consequences of current warming will persist for centuries or longer. A single annual temperature does not define the Paris Agreement threshold, which concerns sustained warming; confusing the two can mislead readers in either direction.
This is the product of choices repeated at enormous scale: fossil fuels burned, forests removed, methane released and infrastructure built for decades of future emissions. Each government and industry decision adds to or reduces that momentum. The effects are uneven, falling hardest on many communities that contributed least to the problem.
There is no honest point at which a journalist can declare the precise date humanity loses control. The future depends on emissions, adaptation and natural systems that science continues to study. But the observed heat is real, and the direction is clear enough to support a far more immediate question: how much additional damage are we willing to choose?
What this could mean.
- Why this could be bad
- A hotter global average shifts the conditions in which weather, ecosystems and societies operate. Small changes in the global mean can accompany serious risks in particular places.
- Possible repercussions
Longer or more dangerous heat episodes could increase illness, strain energy systems and make outdoor work less safe, especially for vulnerable communities.
Some regions could experience greater risks from heavy rainfall, drought or wildfire conditions, though no single event can be attributed solely from the annual global average.
Sustained warming could accelerate losses of glaciers, coral reefs and other sensitive systems, compounding long-term sea-level and livelihood pressures.
The assessment.
- What we are forecasting
- The global mean surface temperature for calendar year 2026 will be at least 1.3°C above the 1850–1900 reference average.
- Time horizon
- By December 31, 2026
- Editorial confidence in the evidence: 96%
- The WMO estimates 2025 temperature near 1.43°C above the pre-industrial baseline; the persistent greenhouse-gas forcing and multi-year record support a high likelihood of another very warm year.
- What could change the outcome
- Year-to-year natural variability and differences across observational data sets affect annual estimates; the figure is an editorial forecast, not WMO guidance for 2026.
The evidence.
- State of the Global Climate 2025 ↗World Meteorological Organization · March 23, 2026
- Earth’s climate swings increasingly out of balance ↗World Meteorological Organization · March 23, 2026