New climate research suggests that the most catastrophic warming scenarios once widely discussed by scientists are becoming less likely, mainly because renewable energy adoption has accelerated and dependence on coal is declining in many regions.Researchers now believe the previous worst-case pathway, which projected approximately 4.5 degrees Celsius of warming by the end of the century, no longer reflects the world’s current trajectory.Updated estimates place the likely upper-end warming scenario closer to 3.5 degrees Celsius.However, scientists also warn that the most optimistic climate goals are increasingly unattainable.According to the new scenarios, limiting global warming to 1.

5 degrees Celsius above pre-industrial levels — the central goal of the 2015 Paris Climate Agreement — is no longer considered realistic under current global emissions trends.Even the best-case scenario now projects temperatures temporarily exceeding that threshold, potentially reaching around 1.7 degrees Celsius before declining later if large-scale carbon removal technologies become viable.

Researchers explained that although investments in solar, wind, and other low-carbon energy sources have improved the outlook, global carbon dioxide emissions continue to rise overall.

Because carbon dioxide remains in the atmosphere for decades to centuries, the effects of current emissions will continue influencing global temperatures long into the future.Climate experts interviewed for the report described the future range of outcomes as “narrowing.” While humanity may avoid the most devastating projections previously modeled, the opportunity to achieve the safest climate targets is also fading.Scientists estimate the world is currently warming by roughly 0.

1 degrees Celsius every five years, placing the planet on a trajectory closer to about 3 degrees Celsius of warming by 2100 unless stronger emissions reductions are implemented globally.