The UN Environment Programme released a report projecting that global temperatures will rise to at least 1.8C above preindustrial levels, surpassing the 1.5C objective established in the Paris agreement of 2015. The document emphasizes that exceeding 1.5C is now unavoidable within the next few years, despite ongoing efforts to address climate change driven by fossil fuel combustion.
The warming scenario outlined in the report carries substantial risks across multiple sectors. Glacier loss exceeding 25% of current mass by 2100 could raise sea levels by up to 13 centimeters. Global food production may decline by up to 14% by 2050 without effective adaptation strategies. Human health, freshwater supplies, ecosystems, urban areas, infrastructure, and economies face severe damage, with some impacts described as irreversible. Vulnerable communities may be forced to relocate or fundamentally alter their economic activities.
According to the report authors, the most viable pathway forward involves an “overshoot, peak and decline” strategy combining immediate and sustained reductions in greenhouse gas emissions with atmospheric carbon dioxide removal. The report designates net zero emissions as an indispensable benchmark that cannot be bypassed, and stresses that carbon removal through mechanisms such as forest expansion must complement rather than substitute for deep cuts in fossil fuel pollution. Temperature could potentially return to 1.5C later this century only if warming remains below approximately 1.8C.
The report has drawn responses from climate advocates and scientists. Pacific island leaders highlighted the report’s significance for regions facing existential climate threats. The UNEP executive director stressed the accelerating nature of climate impacts, noting that extreme heat events already demonstrate how climate effects strike with greater intensity and duration. A report author emphasized that existing governance and policy approaches require fundamental reconfiguration to address overshoot scenarios, encompassing not only emissions reductions but also robust adaptation measures protecting infrastructure and livelihoods.
Analysts noted that achieving the required emissions reductions demands halving global emissions by 2035. Current national policies are projected to produce at least 2.3C of warming, though limiting increases below 2C remains technically feasible if countries meet their net zero commitments by mid-century.
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