In a world grappling with the escalating consequences of climate change, the Paris Agreement stands as a landmark international accord that set ambitious targets to restrict global temperature increase to well below 2 °C above pre-industrial levels, with a preference for keeping warming under 1.5 °C. Despite nearly 200 nations committing to this cause, a pressing question looms large: are the current climate pledges sufficient to meet these critical goals? A groundbreaking study led by Assistant Professor Taeyoung Jin from Jeonbuk National University, in collaboration with Pusan National University researchers, offers a sobering insight into the future trajectory of global warming if current national pledges are adhered to.
Utilizing the sophisticated Regional Integrated Model of Climate and the Economy (RICE-2010), the research team conducted a comprehensive assessment that integrates economic growth, carbon emissions, and climate feedback loops. This model is particularly adept at encapsulating the multifaceted relationship between human economic activities and their climatic consequences. Economic expansion typically leads to increased emissions, which in turn exacerbate climate change, inflicting damages that could ultimately dampen future economic productivity. Through this cyclic interplay, RICE-2010 enables a nuanced simulation of potential long-term outcomes based on varied policy pathways.
The researchers incorporated real-world policy data including countries’ intended emission reductions by 2030 and their longer-term net-zero commitments into the model. They then projected climate and economic outcomes through the year 2300 across four distinct scenarios: a business-as-usual (BAU) scenario where no emission mitigation measures are implemented; a social optimum scenario prioritizing human welfare maximization; a net-zero scenario rooted in existing national commitments; and a scenario adhering strictly to the 1.5 °C warming ceiling.
The study’s findings reveal a stark reality. Under the BAU scenario devoid of climate action, global temperatures could escalate alarmingly by as much as 7 °C by 2300, signaling catastrophic environmental and socioeconomic disruption. In contrast, the net-zero scenario, reflecting current pledged commitments, projects a temperature rise of approximately 2.48 °C, marking a significant improvement yet still overshooting the Paris Agreement’s threshold. This discrepancy underscores the inadequacy of present efforts and the urgent need for heightened ambition.
Quantitatively, the research highlights that an additional reduction of roughly 5 gigatonnes of CO₂-equivalent emissions by 2030 is critical to align global warming trajectory with the safer 2 °C limit. The consequences of failing to deepen emission cuts are equally worrying: climate-induced damages could soar to nearly $65 trillion in economic losses by 2200. However, under the net-zero scenario, these damages shrink to an estimated $19 trillion, while following the 1.5 °C-compliant pathway could further reduce costs to approximately $15 trillion. These stark contrasts illustrate the profound economic dividends of stringent climate action over mere compliance with current pledges.
Beyond the numbers, the study warns of intensifying climate hazards afflicting societies worldwide if action remains insufficient. More frequent and intense heatwaves, exacerbated flooding events, surges in food and energy prices, and increased economic volatility all figure as looming threats. However, Dr. Jin’s team stresses that earlier and more coordinated international action could significantly abate these risks, emphasizing the critical role of global cooperation and policy aggressiveness.
A crucial facet of this research is its use of integrated assessment modeling, which transcends singular disciplinary approaches by weaving together economic, environmental, and policy variables into a dynamic simulation framework. This approach allows for the evaluation of feedback effects and trade-offs between economic growth and climate mitigation, providing policymakers with an evidence-based foundation to recalibrate national climate strategies.
Dr. Taeyoung Jin reflects on the implications, stating, “While current climate promises mark important progress, they fall short of the transformative change needed to safeguard our planet’s future. Proactive and immediate policy adjustments, even if economically challenging in the short term, are indispensable to avert severe long-term damages.” His research epitomizes the critical interplay between ambitious climate commitment and sustainable economic planning.
This study arrives at a pivotal moment as global leaders, emboldened by scientific evidence and mounting climate impacts, prepare to revise their national contributions for upcoming summits. The findings serve as an unequivocal alarm and a roadmap, underscoring the urgency of enhancing emission reduction targets and implementing robust carbon neutrality strategies to achieve meaningful progress towards the Paris temperature goals.
Moreover, the integration of economic welfare considerations into climate modeling showcased in this research enriches understanding of how mitigation actions intersect with social and economic dimensions, thereby equipping policymakers to balance short-term costs against long-term benefits effectively.
The implications of this work extend beyond academia, resonating throughout international policy circles, environmental advocacy groups, and industries focused on sustainable development. It provides a scientifically rigorous, data-driven foundation advocating for a global climate governance framework marked by heightened ambition, equitable burden-sharing, and accelerated transitions toward low-carbon economies.
With a projected temperature increase of about 2.5 °C under current pledges, the study crystallizes the urgency for immediate and intensified action. The human and economic stakes could not be higher, and the path forward demands unwavering commitment, innovative policy mechanisms, and collective resilience to secure a sustainable future for generations to come.
Subject of Research: Energy policy modeling, climate-economic interactions, integrated assessment modeling, carbon neutrality.
Article Title: Evaluating global carbon neutrality commitments: An integrated assessment model approach to the 2 °C target
News Publication Date: December 1, 2025
Web References: https://doi.org/10.1016/j.envsci.2025.104280
References: Jin, T., et al. (2025). Evaluating global carbon neutrality commitments: An integrated assessment model approach to the 2 °C target. Environmental Science & Policy, 174, 104280.
Image Credits: Taeyoung Jin from Jeonbuk National University, Korea
Keywords
Applied sciences and engineering, Environmental sciences, Climatology, Ecology, Environmental engineering
