Researchers at the Potsdam Institute for Climate Impact Research have identified the first statistically significant evidence that the rate of global warming has increased. Using analysis of five major global temperature datasets, the team found that warming has accelerated since approximately 2015.
Temperature measurements over the past decade show an average increase of about 0.35°C per decade, substantially higher than the 0.2°C per decade rate observed between 1970 and 2015. The current warming pace exceeds that of any decade since instrumental temperature records began in 1880. To isolate this trend, researchers filtered out natural temperature fluctuations caused by phenomena such as El Niño cycles, volcanic eruptions, and solar activity variations. The adjusted data revealed the acceleration with over 98 percent statistical certainty, and the same pattern appeared consistently across all five temperature datasets examined, despite their different methodologies and sources.
The team employed two independent statistical approaches to verify their findings. The first used quadratic trend analysis to test whether temperature increases are accelerating over time rather than rising at a constant rate. The second approach, a piecewise linear model, divided the temperature record into separate periods and identified when the warming rate changed. Both methods supported the conclusion of acceleration, with the shift becoming visible in the data around 2013 or 2014 and becoming clearer by 2015.
The research was specifically designed to measure and detect the acceleration rather than identify its underlying causes. However, the authors noted that current climate models can produce periods of accelerated warming, indicating that the observed pattern aligns with physics-based climate simulations. If the warming trajectory of the past decade persists unchanged, long-term temperature increases could exceed the Paris Agreement’s 1.5°C target before 2030, though crossing this threshold depends on sustained warming rather than single-year temperature records. The researchers emphasized that future warming rates will depend significantly on the pace of global reductions in carbon dioxide emissions from fossil fuels.
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