Introduction

Geoengineering refers broadly to deliberate technological interventions intended to influence the Earth's climate system. The concept is generally divided into carbon dioxide removal (CDR) and solar radiation modification (SRM). CDR includes approaches such as direct air capture, enhanced weathering, afforestation and certain forms of bioenergy with carbon capture and storage. SRM involves proposals intended to reflect a portion of incoming solar radiation.

The relationship between geoengineering and energy transition is legally significant because climate mitigation requires changes in energy production and consumption, while some geoengineering technologies may either complement or complicate those changes. CDR technologies can require substantial amounts of electricity, heat, water, land and transport infrastructure. Consequently, energy law can determine whether a geoengineering technology actually contributes to decarbonization.

International law does not presently provide a single comprehensive treaty governing every form of geoengineering. Regulation is instead distributed among climate law, environmental law, marine law, biodiversity law, national energy legislation and general principles of international law.

Concept of energy-transition interaction

The energy transition generally involves movement from carbon-intensive energy systems toward lower-carbon, renewable and more efficient systems.

Geoengineering may interact with this transition in several ways.

First, CDR can potentially remove residual carbon dioxide emissions that are difficult to eliminate completely.

Second, some CDR technologies can increase electricity demand and therefore require additional clean-energy capacity.

Third, reliance on technological carbon removal may influence investment decisions concerning renewable energy, fossil fuels and energy infrastructure.

Fourth, large-scale interventions may create environmental risks that require regulation independent of their potential climate benefits.

The legal challenge is therefore to ensure that geoengineering does not undermine genuine emissions reduction.

Carbon dioxide removal and energy law

CDR technologies are particularly relevant to energy law because many require energy-intensive industrial processes.

Direct-air-capture systems, for example, can require substantial electricity and heat. If that energy is generated from fossil fuels without adequate carbon management, the net climate benefit may be substantially reduced.

A legal framework should therefore evaluate the full lifecycle emissions of CDR projects.

Relevant considerations include:

Energy source.

Electricity consumption.

Process emissions.

Transport requirements.

Storage permanence.

Water consumption.

Land requirements.

Monitoring and verification.

Renewable energy and geoengineering

Renewable electricity can provide energy for certain CDR technologies. Solar and wind resources can therefore indirectly support carbon-removal systems.

However, the additional electricity demand created by CDR must be incorporated into national energy planning.

If renewable electricity that could otherwise replace fossil-fuel generation is diverted to carbon-removal facilities, regulators may need to examine the overall climate benefit.

Energy-transition law should therefore consider whether CDR facilities use additional clean-energy capacity or compete with existing electricity demand.

Carbon capture and storage

Carbon capture and storage (CCS) occupies an important position between conventional energy regulation and climate-engineering policy.

CCS captures carbon dioxide from industrial processes or energy facilities and transports it for geological storage.

Its legal framework may involve:

Capture facilities.

CO₂ transportation.

Pipeline regulation.

Geological storage rights.

Environmental permits.

Monitoring.

Leakage liability.

Closure obligations.

Long-term liability is particularly important because stored carbon dioxide is intended to remain isolated for extended periods.

Carbon removal versus emissions reduction

A fundamental legal-policy distinction exists between removing existing atmospheric carbon dioxide and preventing new emissions.

Energy-transition legislation should not automatically treat one as equivalent to the other.

Reducing emissions from electricity generation, transportation and industry directly addresses the source of climate pollution. CDR may instead address residual or historical emissions.

A sound regulatory framework should therefore establish a mitigation hierarchy in which direct emissions reduction remains central and carbon removal is used for appropriate residual emissions.

Solar radiation modification

SRM raises substantially different legal questions from CDR.

Potential techniques include stratospheric aerosol injection and other methods designed to alter the amount of solar radiation reaching the Earth's surface.

Unlike CDR, SRM would not remove carbon dioxide from the atmosphere. It could therefore potentially influence temperature while leaving other consequences of elevated atmospheric CO₂ unresolved.

This distinction is legally significant because reducing temperature alone would not necessarily resolve ocean acidification or other carbon-related environmental effects.

International environmental law

Geoengineering is subject to broader principles of international environmental law.

The Convention on Biological Diversity (CBD) has adopted decisions concerning climate-related geoengineering and emphasized precautionary approaches to activities that may affect biodiversity.

The CBD framework is particularly relevant where geoengineering could have transboundary or ecosystem-level effects.

The London Convention and London Protocol are also relevant to certain marine geoengineering activities, particularly where materials are deliberately introduced into the marine environment.

Precautionary principle

The precautionary principle is especially important because the environmental consequences of large-scale geoengineering may be uncertain.

The principle supports careful assessment before undertaking activities where there is a risk of serious environmental harm despite scientific uncertainty.

In Vellore Citizens Welfare Forum v. Union of India, (1996) 5 SCC 647, the Indian Supreme Court recognized the precautionary principle and sustainable development as important environmental principles. The judgment is not binding outside India but provides useful comparative jurisprudence.

Environmental impact assessment

Large-scale geoengineering projects should be subject to rigorous environmental impact assessment.

Assessment should consider:

Direct environmental effects.

Indirect effects.

Transboundary consequences.

Biodiversity impacts.

Water requirements.

Energy requirements.

Reversibility.

Cumulative effects.

For CDR and CCS, assessment should also examine lifecycle emissions and long-term storage risks.

Transboundary harm

Geoengineering creates unusual transboundary legal problems because atmospheric and climate systems do not respect national boundaries.

The Trail Smelter Arbitration (United States v. Canada) is a classic comparative authority concerning transboundary environmental harm. The tribunal recognized the principle that a State should not permit activities within its territory to cause significant environmental injury in another State.

Although the case did not concern geoengineering, its reasoning is relevant to projects capable of producing cross-border environmental consequences.

State responsibility

If a geoengineering activity causes significant harm beyond national territory, questions of international responsibility may arise.

Relevant principles include:

Territorial sovereignty.

Due diligence.

Prevention of transboundary harm.

Environmental impact assessment.

Cooperation.

Notification and consultation.

The absence of a comprehensive geoengineering treaty does not necessarily mean that States are free from existing international legal obligations.

Climate governance

The Paris Agreement focuses principally on reducing greenhouse-gas emissions and increasing removals by sinks. It does not establish a comprehensive authorization regime for geoengineering.

Article 4 requires Parties to undertake progressively stronger mitigation efforts, while Article 7 addresses adaptation.

The Paris framework therefore provides an important context for evaluating CDR, but it does not automatically authorize every proposed geoengineering technology.

Energy subsidies and public funding

Government funding can significantly influence the development of geoengineering technologies.

Energy-transition policy may provide grants, tax incentives, research funding or infrastructure support for CDR and related technologies.

Legal frameworks should require transparent criteria concerning:

Climate effectiveness.

Lifecycle emissions.

Permanence.

Cost.

Environmental risks.

Monitoring.

Public accountability.

Public support should not automatically be granted merely because a technology is described as "carbon negative."

Monitoring, reporting and verification

Carbon-removal projects require reliable measurement because claimed atmospheric removals can affect climate-policy accounting.

A legal framework should establish standards for:

Measurement.

Reporting.

Verification.

Baseline determination.

Permanence.

Leakage.

Reversal events.

Without credible verification, governments or companies could claim climate benefits that do not actually correspond to atmospheric carbon removal.

Liability and permanence

Long-term carbon storage raises difficult liability questions.

If stored carbon dioxide later escapes, the legal system must determine:

Who is responsible?

Who bears remediation costs?

How long liability continues?

Whether financial security is required.

Whether monitoring obligations continue after project closure.

These questions are particularly important for geological storage projects because their environmental responsibilities can extend far beyond the operational life of the facility.

Public participation

Large-scale geoengineering projects can affect communities, ecosystems and potentially neighboring countries.

Environmental governance should therefore provide appropriate mechanisms for:

Public information.

Consultation.

Environmental review.

Disclosure of project risks.

Access to relevant non-confidential information.

Public participation can improve legitimacy and help identify risks that may not be apparent from purely technical assessments.

Intellectual property and technology transfer

Advanced CDR technologies may depend upon patented equipment, specialized materials and proprietary processes.

Energy-transition law may therefore intersect with intellectual-property regulation and international technology-transfer arrangements.

Governments must balance incentives for innovation with public-interest requirements concerning safety, environmental monitoring and access to essential technical information.

Energy-system planning

The interaction between geoengineering and energy transition should ultimately be incorporated into national energy planning.

A national authority assessing a major CDR programme could evaluate:

Additional electricity requirements.

Source of that electricity.

Lifecycle emissions.

Infrastructure requirements.

Water consumption.

Storage capacity.

Environmental risks.

Cost per tonne of verified removal.

Alternative mitigation options.

This approach prevents carbon removal from being evaluated independently of the energy system that supports it.

Comparative judicial principles

Several environmental and energy cases provide useful comparative principles.

Massachusetts v. Environmental Protection Agency, 549 U.S. 497 (2007) recognized the legal significance of greenhouse-gas emissions within the United States regulatory framework. Although it concerned U.S. law rather than geoengineering, it illustrates how climate science can influence environmental regulation.

Urgenda Foundation v. State of the Netherlands, Supreme Court of the Netherlands, 20 December 2019, demonstrates the judicial significance of governmental climate obligations. It does not establish a general geoengineering authorization principle but illustrates the relationship between climate protection and governmental responsibility.

Energy Watchdog v. CERC, (2017) 14 SCC 80 provides comparative guidance concerning contractual and regulatory issues in energy projects. It is not directly a geoengineering case.

These authorities should be treated as comparative jurisprudence rather than binding rules for every jurisdiction.

Geoengineering and sustainable development

The central legal challenge is balancing climate mitigation with environmental protection and sustainable development.

The deployment of a technology should not be justified solely by its potential to reduce global temperatures if it creates disproportionate local environmental damage or significant transboundary risks.

The sustainable-development approach therefore requires consideration of economic, environmental and social consequences together.

Conclusion

The interaction between geoengineering and energy transition creates a new area of energy and environmental governance. Carbon dioxide removal may complement conventional decarbonization by addressing residual emissions, but many CDR technologies require substantial energy, infrastructure and resources. Their climate benefits must therefore be evaluated on a full lifecycle basis.

Solar radiation modification raises even broader legal questions because it could affect atmospheric and climate processes without removing carbon dioxide. Its potential transboundary consequences make international cooperation, precaution and environmental assessment particularly important.

Existing legal principles—including sustainable development, precaution, prevention of transboundary harm, environmental impact assessment and State responsibility—provide an initial legal framework even though no single comprehensive international geoengineering treaty exists.

Comparative authorities such as Vellore Citizens Welfare Forum, Trail Smelter, Massachusetts v. EPA, Urgenda and Energy Watchdog provide useful principles concerning precaution, environmental harm, climate governance and energy regulation. Their legal force varies by jurisdiction and they should not be treated as binding authorities outside their respective legal systems.

Ultimately, energy-transition policy should prioritize direct emissions reduction, renewable-energy deployment, energy efficiency and system modernization. Geoengineering and carbon-removal technologies can potentially complement these measures where scientifically justified and properly regulated, but they should not become a substitute for reducing ongoing greenhouse-gas emissions. A legally credible framework therefore requires rigorous environmental assessment, transparent monitoring, lifecycle accounting, clear liability rules, public participation and international cooperation.