Graz Scientists Predict Early Exceedance of 1.5-Degree Climate Threshold by 2026

Researchers at the University of Graz and the Wegener Center have presented new data indicating that the critical global warming threshold of 1.5 degrees Celsius above pre-industrial levels is set to be surpassed as early as 2026. According to their projections, the average global temperature increase for the current year is expected to reach 1.62 degrees Celsius, with a further rise to 1.71 degrees Celsius anticipated in 2027.

The research team, led by geophysicist Gottfried Kirchengast, has developed a new reference dataset for global near-surface air temperatures dating back to 1850. This comprehensive analysis reveals a statistically significant acceleration in temperature increases since 1980. Their findings demonstrate with over 99 percent statistical confidence that the rate of global warming has intensified in recent decades, mainly due to increased greenhouse gas emissions.

The Paris Agreement established a goal to keep the long-term rise in global temperature well below 2 degrees Celsius and to limit the increase to 1.5 degrees Celsius if possible. This target is based on 20-year average temperatures rather than single-year anomalies. However, the Graz researchers' forecast indicates that the 20-year average global temperature could exceed the 1.5-degree threshold as soon as 2026. Furthermore, their models predict that by 2032, the rolling 20-year average could reach 1.7 degrees Celsius, surpassing not only the 1.5-degree target but also the broader objective of staying "well below 2 degrees."

This alarming trend is attributed primarily to ongoing greenhouse gas emissions from human activity. The researchers highlight that their improved ability to forecast future temperature developments is facilitated by a deeper understanding of both anthropogenic climate drivers and natural climate variability, such as the El Niño phenomenon. The El Niño event, currently affecting global climate patterns, enables higher confidence in short- and medium-term climate predictions. The team combined historical observational data with seasonal forecasts and analyzed previous strong El Niño events to refine their outlook.

In their assessment, the lack of more ambitious climate action is a key factor driving these concerning trends. The researchers point to the current extreme heatwave affecting Europe as an example of avoidable climate hazards that are becoming increasingly frequent and severe due to global warming. They have also developed a new methodology for assessing the impact of extreme weather events, allowing for the identification of links between global temperature rise and the frequency and intensity of such events. Their method, when applied to the ongoing European heatwave, demonstrates a clear relationship between extreme temperatures and rising global averages.

These findings come amid growing concerns about the economic and social consequences of persistent and intensifying climate change. The projections suggest that without significant reductions in greenhouse gas emissions, Europe and other regions will continue to face costly and disruptive climate-related events, including heatwaves, droughts, and floods. The team's work underscores the urgency for policymakers to implement more effective climate mitigation strategies to prevent further exceedance of internationally agreed-upon temperature targets and to minimize the risks associated with global warming.