Cap and Share: Global Climate Policy and Emissions Redistribution

Overview

Cap and Share, also recognized as the Global Climate Plan or the Global Climate Scheme, is a policy instrument designed to address the dual challenges of climate change and extreme poverty. This framework operates by capping greenhouse gas emissions through a system of tradable quotas, while simultaneously redistributing the revenue generated from these quotas equally among all human beings. The policy was commissioned in 2005 and remains in a proposed operational status, aiming to integrate environmental sustainability with economic equity on a global scale.

Core Mechanism: Capping Emissions

The foundational element of the Cap and Share policy is the establishment of a cap on greenhouse gas emissions. This cap is implemented through a system of tradable quotas, which allows for market-driven efficiency in emission reductions. By limiting the total volume of greenhouse gases released into the atmosphere, the policy seeks to mitigate the impacts of climate change. The tradable nature of the quotas enables flexibility for emitters, allowing them to buy and sell allowances based on their individual reduction costs and capacities.

Revenue Redistribution and Poverty Alleviation

A distinctive feature of Cap and Share is its approach to revenue redistribution. The revenue generated from the sale or allocation of emission quotas is distributed equally among all human beings. This equal per capita distribution aims to tackle extreme poverty by providing a direct financial benefit to individuals, particularly in developing nations where the cost of living may be lower relative to the value of the carbon quota. This mechanism integrates climate action with social equity, ensuring that the financial benefits of carbon pricing are shared globally.

Policy Status and Historical Context

Commissioned in 2005, Cap and Share has been proposed as a comprehensive solution to the interconnected issues of climate change and poverty. As a proposed policy instrument, it represents a theoretical framework that has yet to be fully implemented on a global scale. The policy's design reflects an effort to create a unified approach to environmental and economic challenges, leveraging market mechanisms to achieve both ecological and social objectives. The ongoing proposed status indicates that while the framework has been defined, its adoption and execution remain subjects of international policy discussions.

History and Development

The "Cap and Share" policy framework, also designated as the Global Climate Plan or Global Climate Scheme, was first introduced in 2005. This proposal emerged from the work of Feasta, the Foundation for the Economics of Sustainability, which sought to address the dual challenges of climate change and extreme poverty through a unified economic mechanism. The core concept involves capping global greenhouse gas emissions via a system of tradable quotas while redistributing the resulting revenue equally among all human beings. This approach distinguishes itself from traditional carbon tax or cap-and-trade models by emphasizing direct dividend distribution to individuals, thereby linking environmental sustainability with social equity.

Terminology and Conceptual Evolution

Following its initial proposal in 2005, the terminology surrounding the policy evolved to reflect its ambitious scope. The framework was increasingly referred to as the Global Climate Plan or Global Climate Scheme, highlighting its intention to serve as a comprehensive international agreement rather than a localized regulatory measure. This shift in nomenclature underscored the proposal's aim to create a unified global market for carbon allowances, where nations would agree on a total emissions cap and allocate quotas based on historical consumption or population metrics. The revenue generated from the auctioning of these quotas was designed to be shared equally among all citizens, creating a direct financial incentive for individual conservation efforts while providing a universal basic income component linked to carbon usage.

Academic Contributions and Refinement

The academic development of the Cap and Share model saw significant contributions from researchers such as Adrien Fabre and others who refined the economic and distributive mechanisms. These scholars analyzed the efficiency of the system in reducing emissions while minimizing the regressive impact often associated with carbon pricing. Fabre and his colleagues explored the implications of equal per-capita distribution, arguing that it would naturally favor developing nations with lower historical per-capita emissions, thereby addressing issues of climate justice. The academic discourse focused on the practical implementation of a global registry, the valuation of carbon allowances, and the integration of the scheme with existing international trade agreements. These contributions helped solidify the theoretical foundation of the policy, positioning it as a viable alternative to more fragmented national climate strategies.

How does Cap and Share work?

Mechanics of the Policy

Cap and Share operates as a policy instrument designed to address climate change and extreme poverty simultaneously (Cap and Share definition). The core mechanism involves capping greenhouse gas emissions through a system of tradable quotas. These quotas are sold to producers, primarily fossil fuel producers, creating a direct cost on emission sources. The revenue generated from this sale is then redistributed equally among human beings, implementing a per-capita redistribution model. This structure aims to balance environmental targets with economic equity.

Role of Floor Prices

While the primary driver is the cap on emissions, the system incorporates the role of floor prices to stabilize the market. Floor prices ensure that the cost of carbon does not fall below a certain threshold, providing predictability for investors and producers. This mechanism helps in maintaining the financial viability of the redistribution scheme by ensuring consistent revenue streams. The combination of a hard cap and a price floor creates a hybrid approach that leverages the strengths of both quantity-based and price-based carbon pricing mechanisms.

Comparison with Standard Carbon Tax

Understanding Cap and Share requires distinguishing it from a standard carbon tax. While both aim to price carbon, their structural differences are significant. The table below outlines the key features of Cap and Share compared to a standard carbon tax, highlighting the unique aspects of the Global Climate Plan.

This comparison underscores how Cap and Share integrates environmental and social objectives into a single framework. The per-capita redistribution is a distinctive feature that directly links carbon pricing to poverty alleviation, a goal not inherently present in standard carbon tax models. The use of tradable quotas provides a market-based approach to achieving emission targets, while the floor price mechanism adds a layer of price stability often lacking in pure cap-and-trade systems.

Economic Principles and Assessment

Cap and Share operates on the foundational economic principle that greenhouse gas emissions constitute a global common-pool resource, the allocation of which determines both climate stability and economic distribution. The policy instrument explicitly aims at tackling the double challenge of climate change and extreme poverty by linking environmental caps directly to income redistribution. Under this framework, the revenue generated from the sale of tradable emission quotas is not retained by governments for general expenditure but is redistributed equally among all human beings. This mechanism ensures that the financial benefits of the carbon cap are shared universally, creating a direct link between the polluter pays principle and global equity.

Comparison with Carbon Tax and Lump Sum Recycling

The structure of Cap and Share differs significantly from a standard carbon tax. While a carbon tax sets a price on emissions but leaves the total quantity of emissions somewhat flexible, Cap and Share fixes the total quantity of emissions (the cap) and allows the market to determine the price through the trading of quotas. This provides greater certainty regarding the environmental outcome, which is critical for meeting specific greenhouse gas reduction targets. Furthermore, the revenue recycling method in Cap and Share is distinct from traditional lump sum recycling often seen in national carbon pricing schemes. In many national systems, carbon tax revenue is used to reduce other taxes or fund public services, which may not directly benefit all citizens equally. In contrast, Cap and Share mandates an equal per capita distribution of the revenue, ensuring that the financial return is directly proportional to the population rather than political budgetary decisions.

Arguments Regarding GDP Impact and Equity

Proponents of the Global Climate Scheme argue that this approach addresses the equity concerns often raised against market-based climate policies. By redistributing the revenue equally, the policy ensures that lower-income individuals, who typically have smaller carbon footprints, receive a net financial gain from the system. This contrasts with scenarios where carbon costs are passed on to consumers without direct compensation, which can disproportionately affect poorer households. The policy instrument is designed to make the transition to a low-carbon economy financially inclusive. The equal sharing of the revenue generated from the tradable quotas means that the economic burden of the cap is shared globally, rather than falling heavily on specific industries or regions. This structure is intended to reduce the political resistance to carbon pricing by demonstrating a clear and immediate financial benefit to the global population. The focus on both climate change and extreme poverty highlights the dual economic and social objectives of the Cap and Share model, positioning it as a comprehensive solution for global environmental and economic challenges.

Impact on Poverty and Income Distribution

The Cap and Share mechanism is designed to function as a progressive fiscal instrument, directly addressing the dual challenges of climate change mitigation and extreme poverty reduction. By capping greenhouse gas emissions through a system of tradable quotas and redistributing the generated revenue equally among the global population, the policy creates a built-in mechanism for income redistribution. This structure ensures that the financial benefits of carbon pricing are not retained by corporations or governments alone but are returned to individuals, thereby enhancing the progressive nature of the climate policy.

Global Basic Income Estimates

According to analysis presented in Adrien Fabre's 2024 book on the subject, the revenue generated from a global Cap and Share scheme could be substantial enough to establish a form of global basic income. The equal per capita distribution of carbon dividends means that lower-income individuals, who typically have smaller carbon footprints than wealthier counterparts, often receive more in dividends than they pay in embedded carbon taxes. This net positive cash flow serves as a direct transfer of wealth from high-emitting sectors and households to the broader population, particularly benefiting those in developing nations.

Poverty Reduction Potential

The redistribution model has significant implications for global poverty alleviation. Estimates suggest that the implementation of the Global Climate Scheme could lift approximately 700 million people out of extreme poverty. This figure underscores the potential of Cap and Share to act not merely as an environmental tool but as a powerful socio-economic lever. By providing a steady stream of income derived from the finite resource of atmospheric carbon capacity, the policy offers a pathway to reduce income inequality on a global scale. The equal sharing of revenue ensures that the poorest members of society receive the same absolute amount as the wealthiest, which represents a larger proportion of their total income, thus enhancing its progressive impact.

Support Among Economists

The "Cap and Share" policy has garnered significant attention from prominent economists who recognize its potential to address both climate change and global inequality. This approach, which combines a cap on greenhouse gas emissions with an equal distribution of revenue, has been endorsed by several leading figures in the field. Their support underscores the policy's viability as a comprehensive solution to the dual challenges of environmental sustainability and economic equity.

Key Supporters and Contributions

Michael Grubb, a well-known energy economist, has been a vocal advocate for Cap and Share. His work highlights the policy's ability to integrate climate goals with social welfare improvements. Similarly, Olivier Blanchard, a former chief economist at the International Monetary Fund, has praised the scheme for its simplicity and effectiveness in achieving broad-based economic benefits.

Other notable supporters include Jean Tirole, a Nobel laureate in economics, who has emphasized the policy's potential to create a fairer distribution of wealth while reducing carbon emissions. Raghuram Rajan, another distinguished economist, has highlighted the scheme's capacity to mitigate the regressive impacts of traditional carbon pricing mechanisms. Joseph Stiglitz, a Nobel Prize-winning economist, has also endorsed Cap and Share, noting its potential to address income inequality alongside climate action. Finally, William Nordhaus, a pioneer in environmental economics, has recognized the policy's innovative approach to balancing environmental and economic objectives.

The collective endorsement of these economists reflects a growing consensus on the merits of Cap and Share as a robust policy instrument. Their insights provide valuable perspectives on how this approach can be implemented to achieve both environmental and economic goals effectively.

Public Opinion and Political Viability

Public acceptance is a critical determinant of the political viability of the Cap and Share policy instrument. Research indicates that when the mechanism is framed as combining a global carbon price with an equal per-capita dividend, support levels are significantly higher than for traditional carbon taxation or pure cap-and-trade systems. This high level of endorsement is attributed to the policy’s ability to address both climate mitigation and income distribution simultaneously.

Survey Evidence from Dechezleprêtre et al. (2022)

Survey data presented by Dechezleprêtre et al. in 2022 demonstrates substantial public support for global carbon pricing mechanisms that include equal cash transfers. The study highlights that voters in Europe and America are more likely to endorse a climate policy that returns revenue directly to households. This finding suggests that the redistributive component of Cap and Share mitigates the perceived regressive nature of carbon pricing. The equal sharing of revenue addresses concerns about cost-of-living increases, thereby enhancing the policy’s appeal across different income brackets.

Findings from Fabre et al. (2025)

Further reinforcing these trends, Fabre et al. (2025) reported high support rates for global carbon pricing with equal cash transfers in Europe and America. The 2025 analysis confirms that the political viability of Cap and Share is strong when the benefits are clearly communicated to the public. The research indicates that the policy’s dual focus on reducing greenhouse gas emissions and alleviating extreme poverty resonates with voters. This alignment with both environmental and social goals contributes to the robust endorsement observed in the survey data.

The consistent findings from these studies suggest that Cap and Share possesses significant political potential. The high support rates in key regions indicate that the policy could be a viable option for policymakers seeking to implement effective climate action. The emphasis on equal revenue distribution appears to be a key factor in securing public approval.

See also

• Global warming projections derived from an observation-based minimal model
• Blue hydrogen production: A case study on CO2 emission reduction in steam methane reforming
• Methane gas emissions: Sources, atmospheric impact and mitigation
• Loss and Damage Fund
• Methane emissions: Sources, atmospheric impact and mitigation

References

1. "Cap and Share" on English Wikipedia
2. Cap and Share: A Global Solution to Climate Change
3. Cap and Share: A Global Solution to Climate Change (Book by Terence Kealey)
4. Cap and Share: A Global Solution to Climate Change (Article in Energy Policy)
5. Cap and Share: A Global Solution to Climate Change (Report by the Cap and Share Foundation)