Attempts to keep warming below 1.5°C are failing. Without a 45% reduction in global emissions by 2030, the 1.5°C goal will move from “hanging by a thread” to “physically impossible.”
There is a technical distinction between a “temporary breach” (a single hot year) and “permanent global warming” (a long-term average).
- The Temporary Breaches (Happening Now)
The 1.5°C line has already been ereached
The First Breach: 2024 was the first individual calendar year on record to exceed 1.5°C above pre-industrial levels, reaching approximately 1.6°C.
The Current Trend: As of January 2026, the average temperature over the last three years (2023–2025) has hovered around 1.48°C to 1.5°C.
Near-Term Outlook: The World Meteorological Organization (WMO) estimates an 86% chance that at least one year between 2025 and 2029 will exceed the 1.5°C threshold.
- The “Paris Agreement” Breach (Expected 2030s)
The 1.5°C goal in the Paris Agreement refers to a 20-year average. This is meant to filter out temporary spikes caused by weather events like El Niño.
The Inevitability: Most climate scientists now consider a long-term breach “basically inevitable.” Even if all emissions arestopped today, the heat already “baked into” the system would likely push us past the mark.
The Timeline: Current projections suggest the world will permanently cross the 1.5°C threshold in the early 2030s—roughly 10 to 15 years sooner than was predicted when the Paris Agreement was signed in 2015.
- Why It Isn’t a “Game Over”
While 1.5°C is a critical tipping point for coral reefs and Arctic ice, it is not a “cliff” where everything fails at once.
Every Fraction Counts: There is a massive difference between 1.5°C and 1.6°C. Every 0.1°C of warming avoided prevents millions of people from facing extreme heatwaves and keeps “tipping points” (like the collapse of the Amazon) at bay.
The “Overshoot” Scenario: Scientists are now focusing on an “overshoot and return” strategy. This involves exceeding 1.5°C temporarily but using massive reforestation and carbon-removal technology to pull temperatures back down by the end of the century.
To understand the current state of global warming, there are three primary indicators: temperature anomalies, greenhouse gas concentrations, and sea level rise.
The following graphs represent data from NASA GISS, NOAA, and the Scripps Institution of Oceanography, illustrating the clear upward trends that define our changing climate.
- Global Temperature Anomaly (1880–2025)
This graph shows the deviation of global surface temperatures from the mid-20th-century average (1951–1980).
The Trend: Temperatures remained relatively stable until the 1970s, after which they began a sharp, accelerating climb.
The 1.5°C Threshold: Notice the spike in 2024–2025. While 2024 was the first year to hit approximately 1.6°C above pre-industrial levels, the long-term average is now rapidly approaching the 1.5°C limit established by the Paris Agreement.
- Atmospheric CO2 Concentration (The Keeling Curve)
This is the primary driver of the temperature rise shown in the first graph.
Recent Data: In February 2025, CO2 levels reached 427.1 ppm (parts per million).
Historical Context: Before the Industrial Revolution, CO2 levels were consistently around 280 ppm. Since monitoring began at Mauna Loa in 1958, the concentration has risen by over 35%, and the rate of increase is still accelerating.
See also the graph of Mauna Loa in this post
- Global Mean Sea Level Rise
As the planet warms, glaciers melt and ocean water expands (thermal expansion).
Acceleration: Since 1880, the global sea level has risen by over 300 mm (12 inches).
Current Rate: The rate of rise has more than doubled from the 20th-century average (1.7 mm/yr) to the current satellite-era rate of over 4 mm/yr.
Why these graphs matter
These datasets are physically linked:
Rising CO2 (Graph 2) traps more heat in the atmosphere.
This heat leads to Rising Temperatures (Graph 1).
Warmer temperatures cause Sea Level Rise (Graph 3) through melting ice and expanding oceans.
The jump seen in the 2024 temperature data is particularly concerning to scientists because it suggests that we are not just approaching 1.5°C, but are beginning to experience the climate system’s response to record-breaking greenhouse gas levels.