Published January 6, 2026 | https://doi.org/10.59350/z89ks-5f305

Relentless climate change 2025

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Here are the changes in temperature and atmospheric CO₂ concentration over recent decades (temperature: 85 years; CO₂: 67 years; Fig. 1 and 2). That is, CO₂ continues to accumulate in the atmosphere, and temperatures keep rising relentlessly. There is a strong correlation between global air temperature and CO₂ (Fig. 3). Obviously, CO₂ is not the only cause of increasing temperature; there are other greenhouse gases. Note also that the data series begin in 1940 (temperature) and 1958 (CO₂), although human-caused climate change began much earlier, around 1890 [1].

Fig. 1. Global surface temperature (daily; left) and atmospheric CO concentration (monthly; right) along the year. Data from 1940 (temperature) and 1958 (CO) to 2025. In red are the values for 2025; in orange for the year I was born! So I have witnessed an increase of 107 ppm (33.5%) in atmospheric CO₂ levels.
Fig. 2. Changes in annual global surface air temperature (oC) from 1940 to 2025.
Fig. 3. Relationship between atmospheric CO concentration (in ppm) and global surface air temperature (oC); data are annual averages from 1958 to 2025.

Data sources: Copernicus Climate Change Service (C3S) and NOAA Global Monitoring Laboratory

References

[1] Pausas JG 2025. The onset of phenological plant response to climate warming. New Phytol. 247: 2495-2498 [doi | pdf | post

Additional details

Description

Here are the changes in temperature and atmospheric CO₂ concentration over recent decades (temperature: 85 years; CO₂: 67 years; Fig. 1 and 2). That is, CO₂ continues to accumulate in the atmosphere, and temperatures keep rising relentlessly. There is a strong correlation between global air temperature and CO₂ (Fig.

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Dates

Issued
2026-01-06T00:58:29
Updated
2026-04-25T19:27:32