1. Introduction

Solar Radiation Management (SRM) refers to a group of proposed climate-intervention techniques designed to reflect a portion of incoming sunlight back into space or otherwise reduce the amount of solar energy absorbed by the Earth.

Unlike conventional climate mitigation, which seeks to reduce greenhouse-gas emissions, SRM attempts to influence the Earth's energy balance and potentially lower global temperatures.

Examples include:

Stratospheric Aerosol Injection (SAI): Releasing reflective particles into the stratosphere to reduce incoming solar radiation.

Marine Cloud Brightening (MCB): Increasing the reflectivity of marine clouds through the introduction of suitable aerosols.

Cirrus Cloud Thinning: Modifying high-altitude ice clouds to increase outgoing infrared radiation.

Space-Based Solar Reflectors: Using space-based structures to reduce the amount of sunlight reaching the Earth.

Surface Albedo Modification: Increasing the reflectivity of selected land or surface areas.

These technologies raise serious cross-border civil liability questions because atmospheric processes do not respect national boundaries.

For Singapore, the issue is particularly significant because of its geographical position in Southeast Asia, its dependence on regional environmental cooperation, its coastal infrastructure, maritime activities and exposure to transboundary environmental risks.

The central legal question is:

Can a person, company, affected community or government pursue a civil claim in Singapore when solar radiation management activities conducted in another country allegedly cause environmental, economic, health or property damage in Singapore?

The answer requires examining Singapore's environmental legislation, negligence law, private nuisance, transboundary pollution principles, international environmental law and jurisdictional rules.

An important qualification is that Singapore has no established body of reported judgments specifically deciding civil liability for cross-border solar radiation management. Existing environmental and tort authorities must therefore be applied by analogy.

2. Nature of Cross-Border Harm Caused by SRM

SRM interventions could potentially create environmental consequences beyond the territory where the activity is conducted.

For example, an organisation operating an atmospheric aerosol injection programme in another country might affect regional atmospheric conditions.

Potential consequences include:

A. Changes in regional rainfall

Large-scale atmospheric interventions could potentially influence regional precipitation patterns.

Possible consequences include:

Agricultural losses.

Reduced water availability.

Flooding in particular locations.

Damage to agricultural infrastructure.

Disruption of water-management systems.

However, the precise magnitude, location and direction of such effects remain scientifically uncertain.

B. Atmospheric and environmental effects

The introduction of aerosols into the atmosphere could create concerns involving:

Atmospheric chemical reactions.

Changes in atmospheric circulation.

Regional air-quality impacts.

Deposition of particles.

Potential effects on ecosystems.

C. Agricultural and economic losses

Changes in precipitation, sunlight and temperature could potentially affect agricultural productivity and food supply chains.

Singapore may experience indirect economic consequences through regional trade, food imports and supply-chain disruption.

D. Marine and coastal consequences

Potential changes in regional weather patterns could affect:

Coastal ecosystems.

Fisheries.

Port operations.

Maritime infrastructure.

Coastal protection systems.

It is important to distinguish scientifically demonstrated environmental effects from hypothetical SRM risks. A civil claimant must establish actual legally relevant harm rather than rely solely on the possibility of adverse consequences.

3. Singapore's Applicable Legal Framework

A. Environmental Protection and Management Act 1999

The Environmental Protection and Management Act (EPMA) provides Singapore's principal statutory framework for environmental pollution control.

It addresses matters including:

Air pollution.

Industrial emissions.

Hazardous substances.

Environmental pollution control.

Regulatory requirements applicable to specified activities.

Where SRM-related operations involve regulated substances, installations or emissions within Singapore's jurisdiction, relevant EPMA requirements may become applicable.

However, the Act does not automatically create a comprehensive civil compensation regime for every environmental effect originating overseas.

A foreign atmospheric intervention causing alleged damage in Singapore would therefore require careful analysis of territorial jurisdiction and the particular statutory provisions involved.

B. Environmental Public Health Act 1987

The Environmental Public Health Act provides a framework addressing public-health and environmental sanitation matters.

It may become relevant where environmental contamination creates public-health or sanitation issues within Singapore.

Nevertheless, it is not a general international SRM compensation statute.

C. Civil Law Act 1909

The Civil Law Act forms part of Singapore's civil-law framework and is relevant to various civil claims and remedies.

Claims concerning negligence, contractual liability and other civil wrongs must be analysed under their applicable substantive legal rules.

D. Common-Law Negligence

Negligence may provide a potential basis for compensation where an SRM operator owes a duty of care to persons affected by its activities.

The claimant generally needs to establish:

A duty of care.

Breach of that duty.

Factual and legal causation.

Legally recoverable damage.

The difficult question is whether an operator conducting atmospheric intervention overseas owes a sufficiently recognised duty of care to individuals or businesses in Singapore.

This would depend on foreseeability, proximity, the relationship between the parties and broader legal considerations.

E. Private Nuisance

Private nuisance may arise where a defendant's conduct causes an unreasonable interference with another person's use or enjoyment of land.

Potential SRM-related examples include:

Physical contamination of property.

Harmful atmospheric deposition.

Interference with agricultural land.

Environmental effects materially affecting residential property.

A claimant must establish the relevant elements of nuisance, including the necessary connection to land and an actionable interference.

A general reduction in regional sunlight or a change in rainfall does not automatically constitute private nuisance.

F. Public Nuisance

Public nuisance may be relevant where conduct causes substantial interference with rights enjoyed by the public or a sufficiently significant section of the public.

Examples might include serious atmospheric contamination or interference with public navigation.

An individual claimant seeking personal damages must establish the applicable requirements, including particular damage beyond that suffered by the general public where required.

G. International Environmental Law

Several international principles are relevant to cross-border SRM disputes:

The no-harm principle.

The precautionary approach.

Environmental impact assessment.

Cooperation and notification.

Sustainable development.

State responsibility for internationally wrongful acts.

These principles may inform the interpretation and development of domestic law, but they do not automatically create a private right to damages against a foreign SRM operator.

4. Transboundary Haze Pollution Act 2014: The Most Important Statutory Analogy

The Transboundary Haze Pollution Act 2014 (THPA) is especially important when studying cross-border environmental liability in Singapore.

It was enacted to address environmental harm originating outside Singapore but affecting the environment and people within Singapore.

A. Section 4: Extraterritorial application

The Act expressly contemplates conduct occurring outside Singapore.

This is significant because a foreign company cannot necessarily avoid Singapore's statutory framework simply because its relevant conduct takes place overseas.

B. Section 5: Offences for causing transboundary haze pollution

Section 5 addresses entities engaging in conduct inside or outside Singapore that causes or contributes to haze pollution in Singapore.

It also addresses certain management relationships involving overseas landowners or occupiers.

C. Section 6: Civil liability

Section 6 is particularly important.

It establishes duties not to engage in conduct that causes or contributes to haze pollution in Singapore, including certain conduct that condones another person's harmful activities.

Under section 6(3), a person in Singapore may bring a civil action for specified consequences, including:

Personal injury.

Disease.

Mental or physical incapacity.

Death resulting from the relevant injury, disease or incapacity.

Physical damage to property in Singapore.

Economic loss, including loss of profits in Singapore.

Section 6(4) provides that the action is maintainable in Singapore even if the conduct is not actionable in the foreign jurisdiction where it occurred.

D. Section 7: Defences

The Act provides specified statutory defences, including certain grave natural disasters and acts of war.

It also provides a defence in defined circumstances where another person acted without the defendant's knowledge or consent or contrary to its wishes or instructions.

E. Can the THPA apply to Solar Radiation Management?

This requires careful legal interpretation.

The THPA is specifically directed at transboundary haze pollution. It should not be treated as a general statute covering every atmospheric intervention.

For example:

A conventional forest-fire haze event may fall within its intended operation.

Aerosol injection undertaken for climate intervention is not automatically equivalent to haze pollution.

A claimant would need to establish that the particular activity and resulting pollution satisfy the statutory definitions and requirements.

Important legal distinction: Section 6 offers a particularly powerful model for cross-border environmental liability, but it cannot simply be extended to every SRM-related climate effect without statutory support.

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5. Important Singapore Case Laws

The following eight decisions provide relevant legal foundations for future SRM cross-border harm litigation. They are environmental, nuisance and negligence authorities rather than direct judgments about solar geoengineering.

Case 1. Animal Concerns Research & Education Society v Tan Boon Kwee [2011] SGCA 2

Court: Singapore Court of Appeal.

Subject: Environmental contamination and negligence.

Background:

Animal Concerns Research & Education Society (ACRES) engaged a contractor to construct an animal shelter.

During the construction process, unsuitable backfill materials were used, resulting in soil contamination and environmental damage.

The contamination raised concerns about groundwater and the nearby Kranji Reservoir.

ACRES pursued a claim against the individual responsible for supervising the construction work.

Judgment:

The Court of Appeal considered the defendant's responsibility for the negligent supervision of the earthworks.

It found that a duty of care could arise in the circumstances and that the defendant's negligence had contributed to the environmental contamination.

The judgment also illustrates that the existence of a statutory obligation does not automatically establish an equivalent private-law duty of care.

Application to SRM:

Suppose a foreign company conducts an atmospheric intervention using unsuitable aerosol materials without adequate scientific testing or safety precautions.

If those activities cause demonstrable environmental damage in Singapore, affected parties may investigate negligence claims against the responsible operators.

The claimant would still need to establish duty, breach, causation and damage.

Legal principle: Persons responsible for environmental operations may incur civil liability where negligent conduct causes foreseeable environmental damage.

Case 2. Spandeck Engineering (S) Pte Ltd v Defence Science & Technology Agency [2007] SGCA 37

Court: Singapore Court of Appeal.

Subject: Duty of care and pure economic loss.

Background:

Spandeck Engineering was involved in a government construction project.

A dispute arose concerning the administration and certification of contractual payments.

The company alleged negligence by the Defence Science and Technology Agency (DSTA), despite the absence of a direct contractual relationship giving rise to the alleged duty.

Judgment:

The Court of Appeal established Singapore's general framework for determining whether a duty of care exists.

The framework consists of:

Factual foreseeability.

Sufficient legal proximity.

Policy considerations that do not negate the imposition of a duty.

The Court also confirmed that the same general duty-of-care framework applies to claims involving pure economic loss.

Application to SRM:

Consider a Singapore agricultural importer or commercial operator suffering financial losses because a foreign SRM operator negligently conducts an atmospheric intervention.

The claimant cannot establish negligence merely by demonstrating that economic losses occurred.

It must establish that the foreign operator owed it a duty of care under the Spandeck framework.

This may be difficult where the affected persons are numerous, geographically dispersed and not directly connected to the operator.

Legal principle: Foreseeability alone is insufficient; legal proximity and policy considerations must also be established.

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Case 3. Tesa Tape Asia Pacific Pte Ltd v Wing Seng Logistics Pte Ltd [2006] SGHC 73

Court: Singapore High Court.

Subject: Negligence, nuisance and the rule in Rylands v Fletcher.

Background:

Tesa Tape and Wing Seng Logistics occupied adjoining industrial properties.

Wing Seng stored shipping containers in large stacks on its premises.

During a thunderstorm, several containers collapsed across the boundary and damaged Tesa Tape's property.

Tesa Tape commenced proceedings based on negligence, nuisance and the rule in Rylands v Fletcher.

Judgment:

The High Court examined whether the stacking arrangement was unsafe and whether the defendant's conduct amounted to an unreasonable use of its premises.

The judgment considered the relevance of foreseeability, the nature of the activity and the alleged escape of dangerous material or objects.

Application to SRM:

A private SRM facility might release aerosols or other materials that subsequently travel beyond the operator's control.

A claimant could examine whether the relevant activity creates an actionable nuisance or negligence claim.

However, an important difference exists: the Tesa Tape dispute concerned neighbouring properties and physical objects, whereas atmospheric intervention may involve geographically dispersed environmental processes.

Legal principle: A defendant's use of property and its responsibility for harmful physical consequences may be examined through negligence and nuisance principles.

eLitigation

Case 4. PEX International Pte Ltd v Lim Seng Chye [2019] SGCA 82

Court: Singapore Court of Appeal.

Subject: Private nuisance, hazardous activities and remoteness of damage.

Background:

PEX International engaged a contractor to carry out construction works at its property.

Hot works were being undertaken when a fire occurred and caused extensive damage to neighbouring property owned by Lim Seng Chye.

The claimant pursued negligence, private nuisance and a claim under the rule in Rylands v Fletcher.

Judgment:

The Court of Appeal examined the distinction between negligence and nuisance.

It emphasised that foreseeability operates differently in the two torts:

In negligence, foreseeability concerns the risk of harm and the existence of a duty.

In nuisance, foreseeability is relevant to determining the recoverability of the type of damage suffered.

The Court dismissed the appeals and upheld the relevant findings of liability in nuisance and under the rule in Rylands v Fletcher.

Application to SRM:

Suppose an overseas operator undertakes an intervention that releases hazardous substances into the atmosphere.

Those substances allegedly travel across borders and produce physical contamination or damage to property in Singapore.

The claimant may need to establish:

The nature of the interference.

Whether the interference is actionable in nuisance.

Whether the relevant harm was sufficiently foreseeable.

Whether the defendant is legally responsible for creating or continuing the nuisance.

Legal principle: Foreseeability and remoteness must be carefully distinguished when bringing negligence and nuisance claims involving environmental harm.

eLitigation

Case 5. See Toh Siew Kee v Ho Ah Lam Ferrocement (Pte) Ltd and others [2013] SGCA 29

Court: Singapore Court of Appeal.

Subject: Occupiers' liability and negligence.

Background:

The case concerned the responsibility of occupiers and the application of negligence principles to risks arising from activities on premises.

The Court considered the appropriate legal framework for determining whether an occupier owes a duty of care to persons exposed to risks associated with the premises.

Judgment:

The Court confirmed the importance of the Spandeck framework in assessing duties of care arising in the context of occupiers' liability.

The decision helps clarify the relationship between control over premises, foreseeable harm and legal responsibility.

Application to SRM:

An organisation operating a ground-based aerosol facility or research installation may exercise control over dangerous substances, equipment and operational procedures.

Where an activity causes environmental damage, the extent of the operator's control and responsibility may be relevant to determining negligence.

This authority does not itself establish a duty owed by an overseas atmospheric operator to every person in Singapore.

Legal principle: Responsibility for risks arising from controlled activities must be examined through the applicable negligence framework.

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Case 6. Tan Bee Hock v F G Builders Pte Ltd [2016] SGHC 37

Court: Singapore High Court.

Subject: Negligence, nuisance and physical damage.

Background:

The dispute involved building-related materials placed on a road and the resulting danger to motorists.

The claimant alleged that the defendant had failed to ensure that the materials were safely positioned and maintained.

Judgment:

The High Court applied the Spandeck test and considered whether the defendant owed a duty to take reasonable care.

It examined factual foreseeability, proximity, the appropriate standard of care and whether the defendant's conduct caused the claimant's loss.

The court also considered the nuisance claim and the pleaded breach of statutory duty.

Application to SRM:

Suppose a company undertaking atmospheric research fails to maintain adequate safety procedures and creates a foreseeable risk of physical damage.

The decision provides useful guidance on establishing negligence through the relationship between the defendant's conduct and the claimant's injury.

It also illustrates why claimants should distinguish between negligence, nuisance and statutory-duty claims rather than treating them as interchangeable.

Legal principle: Environmental and physical-damage claims require proof of the applicable duty, breach and causal connection.

laws.sg

Case 7. NTUC Foodfare Co-operative Ltd v SIA Engineering Co Ltd [2018] SGCA 41

Court: Singapore Court of Appeal.

Subject: Negligence, proximity and causation.

Background:

The dispute concerned alleged negligence and the responsibility of parties whose activities affected another party's commercial interests.

The case required the Court to apply the Spandeck framework and examine the legal relationship between the parties.

Judgment:

The Court reaffirmed that a duty of care requires factual foreseeability, sufficient proximity and the absence of policy considerations negating liability.

It also examined the significance of causation in negligence proceedings.

Application to SRM:

Imagine a Singapore-based company suffering business losses after a foreign climate-intervention project.

The fact that the foreign operator's activities may have influenced regional climate conditions does not automatically establish a duty of care to that company.

The claimant must demonstrate a sufficiently close legal relationship and establish that the defendant's breach caused the particular loss.

Legal principle: Economic consequences of another party's conduct do not automatically establish negligence liability.

eLitigation

Case 8. Lim Seng Chye v PEX International Pte Ltd [2019] SGHC 28

Court: Singapore High Court.

Subject: Fire damage, negligence, nuisance and hazardous activities.

Background:

The case concerned a fire arising from hot works conducted at neighbouring premises.

The claimant alleged that the activities created an unreasonable risk and caused substantial physical damage.

Judgment:

The High Court considered the claims in negligence, private nuisance and under the rule in Rylands v Fletcher.

The subsequent Court of Appeal decision in PEX International Pte Ltd v Lim Seng Chye [2019] SGCA 82 clarified important principles concerning foreseeability, nuisance and hazardous activities.

Application to SRM:

The case provides a useful analogy where an atmospheric intervention involves the introduction of materials or processes capable of creating environmental risks beyond the operator's immediate premises.

However, an SRM claimant would have additional scientific and jurisdictional difficulties that were not present in this domestic property dispute.

Legal principle: Courts may examine the consequences of hazardous activities through established tort principles, with particular attention to nuisance and remoteness.

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6. Major Legal Challenges in Cross-Border SRM Litigation

A. Scientific Causation

This is potentially the greatest obstacle to a successful SRM claim.

Atmospheric systems involve complex interactions between:

Aerosol concentration.

Wind direction and atmospheric circulation.

Temperature distribution.

Precipitation.

Ocean-atmosphere interactions.

Regional climatic variability.

A claimant must distinguish the alleged effects of a particular SRM intervention from natural climate variability and other human activities.

For example, if rainfall in Singapore decreases following an overseas aerosol injection programme, temporal coincidence alone cannot establish legal causation.

The claimant would need scientific evidence demonstrating the relevant causal connection to the required civil standard of proof.

B. Identifying the Responsible Defendant

SRM projects may involve several participants:

Research institutions.

Private technology companies.

Aerosol manufacturers.

Project financiers.

Government agencies.

Satellite operators.

International research consortia.

A major challenge is identifying which participant should bear legal responsibility.

The organisation funding a project may not necessarily be liable for every operational decision made by an independent contractor.

The claimant must establish an appropriate legal basis for attributing responsibility to each defendant.

C. Extraterritorial Jurisdiction

A Singapore claimant may seek proceedings against a company incorporated overseas.

Important questions include:

Does the Singapore court have jurisdiction?

Can the foreign defendant be served outside Singapore?

Is Singapore the appropriate forum?

Where is the defendant's evidence located?

Can a Singapore judgment be enforced in the foreign country?

The THPA provides a particularly important statutory route for qualifying haze claims. Outside that Act, ordinary jurisdictional and procedural rules become significant.

D. Difficulty Proving Individual Loss

Climate-related effects may affect entire regions rather than isolated properties.

For example, a change in rainfall may affect thousands of agricultural producers.

However, each claimant may experience different consequences.

A claimant must establish individual or legally recognised collective loss rather than rely solely on general environmental concerns.

E. Multiple Contributing Causes

Environmental harm may result from several contributing factors.

For example:

An overseas SRM programme.

Greenhouse-gas emissions.

Natural atmospheric circulation.

Regional deforestation.

El Niño or La Niña events.

A claimant must address these competing explanations and establish the relevant causal contribution under the applicable legal principles.

F. Corporate Responsibility and Parent-Company Liability

A multinational corporation may operate SRM research through subsidiaries and overseas contractors.

The parent company is not automatically liable merely because it owns the subsidiary.

However, liability may arise where the parent itself assumes relevant responsibilities, exercises legally significant control, makes negligent decisions or independently contributes to the actionable conduct.

7. Potential Civil Claims and Remedies

A. Compensatory Damages

A successful claimant may seek compensation for established losses, such as:

Physical damage to property.

Personal injury.

Medical expenses.

Agricultural losses.

Business interruption.

Lost profits.

Reasonably established environmental restoration costs where recoverable.

B. Injunctions

An injunction may be appropriate where an ongoing or imminent activity creates an actionable legal interference.

For example, a Singapore claimant might seek an injunction restraining a defendant from continuing an activity that creates a legally established nuisance affecting the claimant's property.

However, obtaining an injunction against an overseas SRM programme would involve significant jurisdictional and practical difficulties.

C. Declaratory Relief

A claimant may seek a judicial declaration concerning the parties' legal rights and obligations.

For example, a court may be asked to determine whether particular conduct amounts to an actionable breach of duty.

D. Environmental Restoration

Where environmental damage has occurred, restoration or remediation may be relevant to the assessment of damages or other appropriate relief.

The availability of a particular remedy depends on the cause of action and the court's jurisdiction.

8. International Environmental Law and SRM

Cross-border SRM disputes cannot be understood solely through Singapore domestic law.

Several international legal principles are relevant.

A. No-Harm Principle

The no-harm principle requires states to exercise due diligence to prevent significant environmental damage to other states arising from activities within their jurisdiction or control.

It is particularly relevant where an SRM programme could produce transboundary atmospheric effects.

However, the principle primarily concerns international responsibility between states. It does not automatically establish a private damages action against an individual company.

B. Precautionary Approach

The precautionary approach recognises that scientific uncertainty should not necessarily prevent protective environmental measures where there are threats of serious or irreversible damage.

In SRM governance, this supports:

Risk assessment.

Scientific monitoring.

Transparent research.

Appropriate safeguards.

International cooperation.

Its precise legal effect depends on the applicable treaty and domestic legal framework.

C. Environmental Impact Assessment

Environmental impact assessment is particularly important where proposed activities may create significant transboundary environmental consequences.

An SRM project should be assessed for possible impacts on:

Atmospheric circulation.

Regional precipitation.

Biodiversity.

Agriculture.

Human health.

Marine ecosystems.

The International Court of Justice's decision in Pulp Mills on the River Uruguay (Argentina v Uruguay) (2010) is an important international authority concerning environmental impact assessment and transboundary environmental obligations.

D. State Responsibility

Under international law, a state may incur responsibility where conduct attributable to it breaches an applicable international obligation.

However, the conduct of a private SRM company is not automatically attributable to its home state.

Attribution, state involvement, due diligence and the particular international obligation must be examined separately.

E. Climate Change Convention Framework

The United Nations Framework Convention on Climate Change and the Paris Agreement provide important international climate-governance frameworks.

However, neither should be interpreted as automatically authorising every proposed SRM activity or establishing a comprehensive private compensation system for SRM-related harm.

9. Evidence Required for a Successful SRM Claim

The evidentiary requirements would be unusually demanding.

A claimant should consider obtaining the following categories of evidence.

The importance of expert evidence

Scientific experts would be essential in determining whether an alleged environmental consequence is attributable to a particular SRM intervention.

For example, a climate scientist might assess atmospheric circulation, while an environmental chemist might examine aerosol deposition and a medical expert might assess alleged health consequences.

The court would ultimately determine the legal questions of causation, liability and recoverable damage.

10. Hypothetical Singapore Litigation Scenario

Consider the following situation.

Illustrative cross-border SRM dispute

Foreign territory

Country A

Injecting Reality Into Debates About Solar Radiation Modification

resources.org

A private company operates a stratospheric aerosol injection programme.

Alleged atmospheric transport and regional effects

Affected territory

Singapore

Marina Barrage

siww.com.sg

Agricultural businesses and property owners allege that the intervention caused environmental damage and economic losses.

Potential legal proceedings

Identify the foreign operator and other responsible parties.

Obtain atmospheric and meteorological evidence.

Establish the causal connection.

Determine whether Singapore has jurisdiction.

Identify the applicable cause of action.

Seek damages or other appropriate relief.

Possible legal arguments

Claimant's arguments:

The intervention created foreseeable environmental risks.

The operator failed to undertake adequate scientific assessment.

The activity caused legally recognisable damage in Singapore.

The defendant breached an applicable duty of care.

The claimant suffered measurable financial or physical loss.

Defendant's arguments:

The alleged environmental effects were scientifically uncertain.

Natural climatic variability caused the damage.

The claimant cannot establish legal proximity.

The activity complied with applicable regulatory requirements.

The claimed loss is too remote.

Another party was responsible for the alleged damage.

The court would need to assess these arguments under the relevant Singapore legal principles.

11. Recommendations for Strengthening Singapore's Legal Framework

Singapore could consider the following reforms to address future SRM-related disputes.

Priority reform: A statutory SRM liability framework

A dedicated statutory framework could establish:

Definitions of regulated SRM activities.

Licensing and authorisation requirements.

Mandatory transboundary risk assessments.

Operator reporting obligations.

Scientific monitoring and disclosure.

Civil liability for qualifying environmental harm.

Rules concerning causation and evidentiary presumptions.

Compensation mechanisms for affected persons.

Cross-border cooperation and enforcement procedures.

Such legislation would help avoid excessive dependence on tort principles originally developed for conventional physical pollution and neighbouring-property disputes.

12. Overall Assessment of the Case Laws

The most important authorities for this topic can be summarised as follows:

13. Conclusion

Civil Law and Solar Radiation Management Cross-Border Harm Claims in Singapore represent an emerging area at the intersection of environmental law, negligence, private nuisance, international environmental law, scientific evidence and transboundary corporate accountability.

Singapore's Transboundary Haze Pollution Act 2014 is particularly significant because it demonstrates that domestic legislation can impose civil duties concerning qualifying environmental harm caused by conduct outside Singapore.

However, its application to SRM activities cannot be presumed. Existing tort principles remain important, particularly the Spandeck framework for negligence, the law of private nuisance and the principles governing hazardous escapes.

The most serious challenges will be proving scientific causation, identifying responsible operators, establishing legal proximity, overcoming jurisdictional obstacles and obtaining enforceable remedies against overseas defendants.

Ultimately, Singapore's existing civil-law framework offers useful foundations for addressing future SRM-related environmental disputes, but a dedicated statutory regime would provide greater certainty, accountability and protection for persons affected by cross-border climate interventions.

Research note: No reported Singapore judgment cited above directly adjudicates liability for solar radiation management. The authorities are presented as relevant legal analogies, not as precedents establishing SRM-specific liability.