Once there was…
a planet whose temperature record looked like a jagged line—upward overall, but constantly wobbling from year to year. Those wobbles made it easy for people to argue over what the “real” trend was, especially when short-term natural events temporarily masked or boosted the heat.
Every day,
scientists tracked Earth’s temperature and saw familiar sources of “noise” moving the needle: El Niño and La Niña cycles in the Pacific, cooling bursts from volcanic eruptions, and subtle ups and downs tied to solar cycles. The long-term warming signal was there—but it often hid behind the clutter of natural variability.
Until one day,
researchers at the Potsdam Institute for Climate Impact Research (PIK), working with a US statistics expert, published a study in Geophysical Research Letters that sharpened the picture. Their approach was straightforward but powerful: filter out the known natural influences from the observational temperature data so the underlying long-term warming trend becomes easier to see.
As Grant Foster, a co-author of the study, put it:
“We can now demonstrate a strong and statistically significant acceleration of global warming since around 2015.”
And importantly, he explained why the analysis is so revealing:
“We filter out known natural influences in the observational data, so that the 'noise' is reduced, making the underlying long-term warming signal more clearly visible.”
Because of that,
the temperature record—once dominated in the public imagination by annual swings—told a clearer story: global warming didn’t just continue; it sped up. The study reports a strong and statistically significant acceleration since around 2015, visible once El Niño effects, volcanic disruptions, and solar-cycle variations are removed from the data.
In other words, the “ups and downs” didn’t disappear because the climate stopped varying; they were accounted for so we could see what was happening underneath. And what was happening underneath was a faster climb.
Because of that,
the new finding lands in a moment when many people already feel the heat in daily life. Broader 2026 climate coverage has focused on record temperatures, intensifying heat waves, and major ocean-atmosphere patterns like strong El Niño developments—all feeding heightened public interest in whether warming is merely persisting or accelerating. This study doesn’t depend on dramatic extremes to make its case; it points to the long-term signal itself becoming steeper after about 2015.
Ever since then,
the question has shifted from “Is warming still happening?” to something more urgent: How fast is it now increasing, and what does that imply for the near future? If the underlying trend is accelerating—and the analysis indicates it is—then planning based on older rates of warming risks being out of date. Filtering out natural variability doesn’t make the world warmer; it makes the warming easier to measure, harder to dismiss, and more pressing to confront.
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