The United Nations Environment Programme (UNEP) released a report on September 2, 2026, warning that global temperatures are expected to exceed 1.5 degrees Celsius above pre-industrial levels within the next few years [1, 2, 3, 4, 5]. UNEP Executive Director Inger Andersen said, "Global temperature rise is set to cross 1.5C, likely within the next few years, pushing climate risks and impacts to increasingly dangerous heights, but it is still possible to bring temperatures down and achieve global goals in the Paris Agreement." [3]
Exceeding the 1.5°C threshold will increase the frequency of extreme weather events and intensify pressures on ecosystems, glaciers, and low-lying coastal cities [1, 2, 3, 5]. The report highlights potential irreversible tipping points, including destabilization of major ice sheets, degradation of the Amazon rainforest, and disruption of ocean circulation patterns [3].
UNEP said limiting warming to 1.5°C is still possible but requires rapid and sustained emission cuts combined with net-negative emissions, although the outlook carries high uncertainty [2, 3, 5]. The report outlines an 'overshoot, peak and decline' pathway to minimize time spent above 1.5°C before returning below it through deep cuts in emissions and increased carbon removal [3, 4].
Even under the most optimistic scenario where all current climate pledges are fully implemented, global temperatures are projected to peak at around 1.8°C above pre-industrial levels, potentially by 2050 [2, 3, 4, 5]. If current policies continue without stronger measures, the median global temperature increase could reach about 2.6°C by 2100 [2, 5].
The report warns that delays in emissions reductions and every 0.1°C rise above 1.5°C increase risks, hinder ecological recovery, and can cause irreversible damage even if warming later declines [2, 5].
Experts in Taiwan urge rapid carbon emission reductions by 2035 alongside strengthened climate disaster response mechanisms similar to typhoon emergency systems. Xu Xinwei, Deputy Professor at Taipei Tech, compared the current warming trajectory to an "out-of-control speeding vehicle," stressing the urgent need to slow down and shorten the time spent above safe limits [4]. Professor Chen Zhengda of National Taiwan Normal University emphasized that Taiwan must focus not only on net-zero by 2050 but also on rapid emission cuts by 2030-2035 through accelerated decarbonization of power, renewable expansion, grid improvements, industrial electrification, and methane reduction [4].
By 2050, warming is expected to threaten 76% of urban tree species in Taiwan, underlining risks to biodiversity and ecosystems [4].
The next major milestone will be monitoring global temperature trends over the coming years as UNEP urges urgent, sustained action to implement emission reductions and avoid crossing irreversible climate tipping points [1, 2, 3, 4, 5].
