International Environmental Law: Basic Principles and the Nigerian Context

Introduction

Environmental law is a collective term describing the network of treaties, statutes, regulations, and common and customary laws addressing the effects of human activity on the natural environment. It is both domestic and international in character — operating simultaneously through national legislation (like Nigeria's National Environmental Standards and Regulations Enforcement Agency Act) and international instruments (like the Paris Agreement and the Convention on Biological Diversity).

This article examines the foundational principles of international environmental law, the institutional architecture through which it operates, and its particular relevance to Nigeria — a nation whose environmental challenges span oil pollution in the Niger Delta, deforestation, flooding, and the accelerating effects of climate change.

The Foundations of International Environmental Law

International environmental law emerged from the recognition that environmental problems — pollution, species loss, climate change — do not respect national borders. A factory in one country can acidify the lakes of another. Carbon emissions from industrial economies affect vulnerable coastal nations. The ozone layer is a shared resource degraded by fluorocarbons released anywhere on Earth.

The first landmark international environmental conference was the Stockholm Conference on the Human Environment in 1972, which produced the Stockholm Declaration and established the United Nations Environment Programme (UNEP). Two decades later, the Rio Earth Summit (1992) produced foundational instruments including the Rio Declaration, Agenda 21, the Convention on Biological Diversity, and the UN Framework Convention on Climate Change.

These instruments, and the thousands of multilateral environmental agreements (MEAs) negotiated since, form the body of international environmental law.

Core Principles

The Sovereignty Principle and Its Limits

States have sovereign rights over their natural resources. This is recognised in Principle 21 of the Stockholm Declaration and Principle 2 of the Rio Declaration. States may exploit their resources "pursuant to their own environmental and developmental policies."

However, this sovereignty is not absolute. The same principles impose a corresponding duty: states have the responsibility to ensure that activities within their jurisdiction or control do not cause damage to the environment of other states or of areas beyond the limits of national jurisdiction.

This tension — between resource sovereignty and transboundary environmental responsibility — runs throughout international environmental law.

The Principle of Sustainable Development

Sustainable development — defined by the Brundtland Commission (1987) as development that "meets the needs of the present without compromising the ability of future generations to meet their own needs" — has become a cornerstone concept. It acknowledges that environmental protection and economic development are not inherently opposed but must be pursued in an integrated manner.

The concept has been incorporated into treaty preambles, development finance conditions, and — increasingly — domestic constitutional and legislative frameworks.

The Precautionary Principle

Where there is scientific uncertainty about the potential environmental harm of an activity, the precautionary principle holds that the absence of full scientific certainty shall not be used as a reason for postponing cost-effective measures to prevent environmental degradation. Principle 15 of the Rio Declaration articulates this approach.

The precautionary principle is particularly relevant in areas like GMO regulation, deep-sea mining, and geoengineering — where the potential harms are serious and potentially irreversible.

The Polluter Pays Principle

Those who produce pollution should bear the costs of managing it to prevent damage to human health or the environment. The polluter pays principle shifts environmental costs from the public to the entities whose activities generate those costs, creating incentives for pollution prevention.

In Nigeria, this principle is relevant to the decades of oil spills in the Niger Delta — one of the most extensive petroleum-related contaminations in the world. The Ogoni clean-up, for which Shell has been held responsible in multiple jurisdictions, is a prominent example of its application.

Common but Differentiated Responsibilities

The Rio Declaration established that states have "common but differentiated responsibilities" (CBDR) for environmental protection. All states bear responsibility for addressing global environmental challenges — but developed countries, which have historically contributed most to problems like climate change and benefit from greater financial and technical capacity, bear greater responsibility.

The CBDR principle underpins the structure of climate change negotiations, where developed countries are expected to take the lead in reducing emissions and to provide financial and technological support to developing nations.

International Environmental Institutions

United Nations Environment Programme (UNEP)

Established by the Stockholm Conference, UNEP is the leading global environmental authority. It catalyses environmental action globally, provides a platform for negotiation of MEAs, and assists developing countries in building environmental governance capacity.

The Conference of the Parties (COP) System

Most major MEAs operate through a Conference of the Parties — an assembly of all signatory states that meets periodically to review implementation, negotiate protocol instruments, and address emerging issues. The annual COP to the UNFCCC (the climate COP) is the most prominent.

International Court of Justice

The ICJ has jurisdiction over disputes between states arising from international environmental law obligations, and has addressed environmental issues in cases concerning the Gabčíkovo-Nagymaros Project (Hungary v Slovakia) and Pulp Mills on the River Uruguay (Argentina v Uruguay). An Environmental Chamber was established within the ICJ in 1993.

Nigeria's Environmental Law Framework

Nigeria's environmental governance framework includes:

• NESREA Act (2007): Establishes the National Environmental Standards and Regulations Enforcement Agency, the primary environmental regulatory authority
• Petroleum Industry Act (2021): Includes environmental provisions governing upstream petroleum operations and establishes a host communities fund
• NOSDRA Act (2006): Establishes the National Oil Spill Detection and Response Agency, responsible for Niger Delta oil spill response
• EIA Act (1992): Requires environmental impact assessment for specified categories of projects

Nigeria has ratified the Paris Agreement, the Convention on Biological Diversity, the Kyoto Protocol, and numerous other MEAs. The challenge — as in many developing countries — lies in the translation of international commitments and domestic legislation into effective regulatory enforcement.

Conclusion

International environmental law is not a remote or theoretical discipline. It has immediate relevance to Nigerian practice — in the legal battles over oil spill liability in the Niger Delta, in the regulatory framework for major industrial projects, in climate finance negotiations, and in the growing number of environmental human rights cases before Nigerian courts.

Lawyers and policymakers who understand the foundational principles of international environmental law — sovereignty, sustainable development, precaution, polluter pays, and common but differentiated responsibilities — are better equipped to navigate this complex and increasingly consequential field.

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Isaac D. Folorunso is the Principal Partner of Isaac Dennis Folorunso & Co., Legal Practitioners and Consultants, Abuja.