Introduction

Rare but catastrophic outcomes are events that occur with very low probability but may cause extremely serious, widespread, or irreversible harm. In biotechnology, examples may include an engineered organism escaping into the environment and causing irreversible ecological damage, a gene therapy producing severe delayed effects, or a biological incident affecting public health on a large scale.

The legal challenge is that conventional risk assessment often focuses on probability, while catastrophic risk requires consideration of the magnitude of harm, uncertainty, and the possibility that consequences may be irreversible. A risk cannot be ignored merely because it is unlikely to occur.

In India, the precautionary principle, environmental protection law, and constitutional duties to protect life and the environment provide the legal foundation for addressing such risks. However, precaution does not mean prohibiting every activity involving uncertainty. It requires proportionate, evidence-based preventive measures where there is a credible threat of serious harm.

Legal Framework and Case Laws

1. Vellore Citizens’ Welfare Forum v. Union of India, (1996) 5 SCC 647

The Supreme Court recognised the precautionary principle as an essential part of sustainable development. It held that where there are threats of serious or irreversible environmental damage, lack of complete scientific certainty should not be used as a reason to postpone preventive measures.

The Court also stated that the burden of demonstrating that an activity is environmentally benign may fall upon the developer or industrial actor. This principle is highly relevant to catastrophic risks because the severity and irreversibility of potential harm may justify precaution even when its probability cannot be precisely established.

Indian Kanoon+1

2. Gene Campaign v. Union of India, 2024 INSC 545

The Supreme Court examined the regulatory approval of genetically modified mustard (DMH-11), including biosafety assessment and the precautionary principle. The Court confirmed that decisions of GMO regulatory authorities are subject to judicial review.

The judgment is relevant to potentially serious environmental risks because it highlights the need for scientifically informed regulation, accountable decision-making, and scrutiny of biosafety procedures. The judges issued separate opinions and differed on the validity of the conditional approval; the approval issue was referred for fresh consideration. It is therefore inaccurate to describe the judgment as a unanimous approval of GM mustard.

Sci API+1

3. A.P. Pollution Control Board v. Prof. M.V. Nayudu, (1999) 2 SCC 718

The Supreme Court emphasised the importance of scientific expertise in environmental decision-making, particularly where complex risks and uncertainty are involved. The decision supports reliance on expert assessment and precaution where conventional legal processes may not adequately address scientific uncertainty.

Principles for Managing Catastrophic Risks

A legally responsible approach should include:

Worst-case assessment: Examine plausible severe outcomes, not merely average expected harm.

Prevention and containment: Use safeguards, monitoring, and emergency-response plans.

Scientific review: Obtain independent expert assessment and update evidence regularly.

Proportionality: Match restrictions to the seriousness and credibility of the risk.

Transparency: Communicate uncertainties and possible consequences honestly.

Conclusion

Rare but catastrophic outcomes require a precautionary and scientifically informed legal approach. Indian environmental jurisprudence recognises that uncertainty cannot justify inaction where serious or irreversible harm is reasonably foreseeable. Vellore Citizens’ Welfare Forum provides the central legal principle, while Gene Campaign demonstrates its relevance to biotechnology regulation. The objective is not to eliminate all uncertainty, but to prevent unacceptable harm through proportionate safeguards, expert scrutiny, monitoring, and accountable regulatory decisions.