In the escalating battle against climate change, the imperative to reduce greenhouse gas emissions has brought to light a critical challenge: how to fairly allocate the rights to remove carbon dioxide (CO₂) from the atmosphere across nations. Recent research from the University of Graz, published in Global Environmental Change, underscores that equitable distribution of carbon removal capabilities is as crucial to achieving global climate targets as the fair sharing of emission reduction responsibilities. This research employs a novel computational model to simulate scenarios of fairness and injustice in carbon dioxide removal, unveiling the potentially massive disparities that could undermine international climate efforts.
Addressing climate change effectively demands not only slashing emissions but also actively removing the residual CO₂ emissions that continue to accumulate. According to the 2015 Paris Agreement, global warming must be constrained to a maximum of 1.5 degrees Celsius above pre-industrial levels. To meet this ambitious target, net-zero emissions must be achieved shortly after mid-century. This reality dictates that all remaining greenhouse gas emissions post-2050 will need to be balanced by removing an equivalent amount of CO₂ from the atmosphere. However, this is a daunting technical challenge as the sustainable capacity of natural and technological CO₂ sinks—such as afforestation projects, bioenergy with carbon capture and storage (BECCS), and direct air capture technologies—is fundamentally limited.
Julia Danzer and Gottfried Kirchengast of the University of Graz crafted an innovative “computer game model” to explore the distribution of limited carbon removal budgets among fictional countries representing diverse economic and demographic conditions. This model, designed to simulate two decades of collaborative climate action within a fictitious Austro-World, reveals profound implications for global justice. In this stylized world, countries such as Richland, Poorland, Wonderland, and Otherland differ in population size and economic power, presenting a microcosm of real-world inequalities.
Under a scenario where CO₂ removal capabilities are shared equally per capita, each country receives a fair portion of the carbon removal “budget.” For example, if the total available removal capacity is set at 100 million tonnes of CO₂, both Richland and Poorland, each with three million inhabitants, receive 33 million tonnes allocations, Wonderland gets 22 million tonnes for its two million people, and Otherland—a country with one million citizens—gets 11 million tonnes. This baseline scenario embodies the principle that each person’s right to benefit from carbon removal is equal, addressing emissions in a way that aligns closely with the ideals of climate justice.
However, the game changes dramatically when economic power and control over CO₂ sinks enter the picture. The researchers investigate “unfair” scenarios where Richland, a wealthy country, leverages its economic dominance to claim a disproportionately large share of the carbon removal budget. This outcome mimics real-world dynamics wherein resource-rich nations or those controlling underground geological formations used for carbon storage can dictate terms that disadvantage poorer countries. In such a skewed allocation, Richland’s share nearly doubles to 63 million tonnes of CO₂, effectively squeezing Poorland’s portion down to 16 million tonnes and significantly limiting the climate remediation options available to smaller, poorer nations.
The consequences of these disparities are stark. When removal budgets are unjustly distributed, the burden of achieving net-zero emissions becomes disproportionately heavy on less affluent countries. This ultimately undermines global cooperation and fairness, potentially eroding trust in international climate agreements. The model highlights that not only must emission rights be shared justly among nations, but carbon removal capacities—vital for offsetting stubborn residual emissions—must also adhere to equitable principles to avoid perpetuating economic and geopolitical inequality.
While the model developed is intentionally simple, it serves as a powerful proof of concept. It clearly illustrates that climate policy must incorporate fairness in the allocation of carbon removal credits to prevent the cementing of dependencies similar to those seen in fossil fuel reliance. For instance, countries currently dependent on oil revenues may transition into gatekeepers of underground reservoirs for CO₂ storage, effectively maintaining leverage over global climate remediation infrastructure. This risk of renewed dependency emphasizes the need for governance frameworks that balance economic interests with moral responsibility.
Both Danzer and Kirchengast stress the long-term nature of scaling up carbon removal technology and methods. Afforestation, reforestation, and development of direct air capture and storage, while promising, require decades to reach the gigatonne scales needed to significantly impact global atmospheric CO₂ levels. Meanwhile, unsustainable or lax climate policies risk overburdening future generations, especially children, with the consequences of inadequate action today. Ensuring fairness in carbon removal allocations therefore becomes essential not only from a practical standpoint but as an ethical imperative.
This research stresses that achieving a just transition in the fight against climate change demands integrating equity into every facet of climate action—including the allocation of removal responsibilities. Without fair sharing of carbon dioxide removal rights, the fight to limit warming to 1.5 degrees Celsius risks becoming another arena of geopolitical contention, reproducing power imbalances that climate policies strive to overcome. The authors advocate for expanding their model to real-world data, a step that would enable policymakers to quantify and address these fairness concerns concretely.
In conclusion, the University of Graz study makes a compelling case for the integration of fairness into the emerging global carbon removal regime. The parable of an unfair game played in a fictional Austro-World starkly warns that if equitable sharing is ignored, wealthier countries could usurp the lion’s share of this vital climate resource, leaving poorer nations disproportionately burdened. As the global community races against time to bridge emission reductions with effective carbon removal, this research presents a timely reminder: the pathway to net-zero must be paved with justice and cooperation, lest it collapse under the weight of inequality.
This study serves as a clarion call for the international community to recognize the intricacies of post-emission climate solutions. It challenges policymakers to look beyond emissions cuts alone and contemplate fair frameworks for sharing the still-limited capacities of natural and engineered carbon sinks. Only by embedding fairness at the heart of carbon removal efforts can the aim of a sustainable and just climate future be realized.
Subject of Research: Not applicable
Article Title: Bringing fairness also into carbon removal shares of countries is essential for a just transition
News Publication Date: 26-Feb-2026
Web References: http://dx.doi.org/10.1016/j.gloenvcha.2026.103114
References: University of Graz/Wegener Center of Climate and Global Change
Image Credits: University of Graz/Wegener Center of Climate and Global Change
Keywords: Carbon dioxide removal, climate justice, net-zero emissions, carbon storage, climate policy fairness, CO₂ sinks, carbon budgets, global warming mitigation, Paris Agreement, international climate cooperation
