Global Steps Towards Environmental Preservation: The Role of International Law

Every time India’s Supreme Court orders a polluting industry to clean up its mess, or when the government imposes a moratorium on a genetically modified crop pending scientific review, there is an invisible thread connecting those decisions back to a conference held in Stockholm in 1972. International environmental law may not always show up as binding treaties with enforcement mechanisms, but its principles have quietly and powerfully shaped how nations – including India – think about, legislate for, and adjudicate over the environment. Understanding how this body of law evolved, and why it matters despite being largely non-binding, is essential for any student of law today.

Where it all began: the Stockholm Declaration of 1972 🔗

Before 1972, environmental protection was largely treated as a domestic matter. There was no shared global framework, no common vocabulary, and certainly no sense that the environment was a subject fit for international law. That changed when the United Nations convened the Conference on the Human Environment in Stockholm, Sweden, from 5 to 16 June 1972. Representatives from 114 countries, 19 inter-governmental agencies, and over 400 non-governmental organisations attended – an unprecedented gathering at the time.

The conference produced the Stockholm Declaration, a set of 26 principles that, for the first time, articulated a globally agreed framework for environmental governance. It is widely regarded as the starting point for international environmental law as a distinct branch of public international law. Among its landmark contributions was Principle 21, which recognised the dual nature of state responsibility: states have the sovereign right to exploit their own natural resources, but they also bear the responsibility to ensure that activities within their jurisdiction do not cause damage to the environment of other states or of areas beyond national jurisdiction. This principle has since become one of the most foundational norms of customary international environmental law.

The Stockholm Declaration also led directly to the creation of the United Nations Environment Programme (UNEP) – the first dedicated international body for environmental protection within the UN system. The Stockholm Conference catalysed a new era of multilateral environmental cooperation and treaty-making. In the two decades following Stockholm, more than 1,100 international legal instruments concerned either fully or partially with the environment were produced – from the 1973 Convention on International Trade in Endangered Species (CITES) to the 1989 Basel Convention on hazardous wastes.

From Stockholm to Rio: twenty years of evolution 🔗

By the early 1990s, the world had changed significantly. Environmental concerns had expanded well beyond transboundary pollution to encompass climate change, biodiversity loss, ozone depletion, and the deep tension between economic development and ecological sustainability. Developing nations, including India, pushed back against a narrative that seemed to prioritise environmental protection at the expense of economic growth. The international community needed a new framework – one that could reconcile development with environmental responsibility.

That framework emerged at the United Nations Conference on Environment and Development (UNCED), commonly known as the Earth Summit, held in Rio de Janeiro from 3 to 14 June 1992. It was one of the largest environmental conferences ever held, with 178 nations participating and around 2,400 representatives of non-governmental organisations in attendance. The Earth Summit produced several landmark instruments: the Rio Declaration on Environment and Development, Agenda 21, the Framework Convention on Climate Change, and the Convention on Biological Diversity.

The Rio Declaration, consisting of 27 principles, built upon and clarified the Stockholm Declaration. By the time of the Rio Conference, the task for the international community had become one of systematising and restating existing normative expectations regarding the environment, as well as boldly positing the legal and political underpinnings of sustainable development. The Rio Declaration’s central aim was practical: to create and restate principles that states could incorporate into their domestic legislation. The goal was that, if enough states adopted these principles nationally, they might eventually harden into binding international law.

The core principles that emerged 🔗

Sustainable development 🔗

Sustainable development is arguably the most consequential concept to emerge from this period of international environmental law-making. The term was formally defined by the Brundtland Commission in its 1987 report Our Common Future as development that meets the needs of the present without compromising the ability of future generations to meet their own needs. Rio’s Principle 1 placed human beings at the centre of this concern, declaring their entitlement to a healthy and productive life in harmony with nature. The concept treats economic growth, social equity, and environmental protection not as competing goals but as interdependent pillars – a shift that fundamentally reoriented how both international and domestic environmental law was framed.

The precautionary principle 🔗

One of the most important – and most debated – principles to emerge from this period is the precautionary principle. Codified in Principle 15 of the Rio Declaration, it provides that where there are threats of serious or irreversible damage, lack of full scientific certainty shall not be used as a reason for postponing cost-effective measures to prevent environmental degradation. In other words, the absence of definitive scientific proof of harm is not a justification for inaction – if the risk is serious enough, precaution must guide decision-making.

The precautionary principle is one of the most prominent and possibly controversial of these principles. While it existed in some national legal frameworks before 1992, the Rio Declaration was the first international instrument to include a definition of the precautionary principle, and it has since been incorporated into numerous multilateral agreements and national laws. In India, the Ministry of Environment and Forests applied this principle in 2010 when it imposed a moratorium on the release of Bt brinjal pending independent scientific studies on its long-term impact on human health and environment – a direct application of international environmental norms at the domestic level.

The polluter-pays principle 🔗

The polluter-pays principle holds that those who cause pollution must bear the financial costs of preventing, controlling, and remedying environmental damage – not the government, and not the public. It was first formally adopted by the OECD in 1972 and subsequently recognised in international law. Principle 16 of the Rio Declaration affirmed that the polluter should, in principle, bear the cost of pollution, with due regard to the public interest and without distorting international trade and investment.

In India, this principle has had a particularly significant judicial journey. The Supreme Court first invoked it in the 1996 Bichhri case (Indian Council for Enviro-Legal Action v. Union of India), where industries discharging toxic chemical waste in Rajasthan were held liable for both compensating victims and restoring the environment. Later the same year, in Vellore Citizens Welfare Forum v. Union of India, the Court went further, institutionalising the polluter-pays principle into India’s environmental jurisprudence and linking it with sustainable development. Today, under Section 20 of the National Green Tribunal Act, the NGT is explicitly directed to apply the polluter-pays principle, the precautionary principle, and sustainable development in its decision-making.

The nature of these principles: soft law and its real-world impact 🔗

A crucial question for law students is this: if the Stockholm and Rio Declarations are not legally binding, why do they matter so much? The answer lies in understanding what lawyers call soft law. Soft law instruments are non-binding agreements which nevertheless hold much potential for morphing into “hard law” in the future. This hardening can happen in two ways: either a soft law declaration becomes the foundation for a binding treaty-making process, or it influences state practice so consistently and widely that its principles crystallise into customary international law.

Binding treaty or a non-binding “soft law” agreement – both are necessary for an effective response to environmental challenges, particularly where environmental impacts are transboundary or global in nature. The Stockholm and Rio Declarations illustrate this well. Though neither is legally binding on states, the aim of the Rio Declaration was to create, clarify, and rearticulate principles that states can incorporate into their domestic legislation – and if enough states did so, those principles might transform into international law norms.

Soft law is also strategically valuable because it is easier to achieve consensus on. Soft law has been very important in the field of international environmental law where states have been reluctant to commit to many environmental initiatives when trying to balance the environment against economic and social goals. By articulating shared aspirations without imposing immediate legal obligations, soft law instruments create a common vocabulary and a normative baseline that shapes national legislation, informs judicial decisions, and eventually produces hard law. Agenda 21 and the Rio Declaration are prime examples of this process in action.

How international norms shaped Indian environmental law 🔗

India’s engagement with international environmental law has been substantial. The Environment (Protection) Act, 1986 – enacted in the wake of the Bhopal gas tragedy – created the overarching framework for environmental regulation in India. Statutes like the Water (Prevention and Control of Pollution) Act, 1974, the Air (Prevention and Control of Pollution) Act, 1981, and the Biological Diversity Act, 2002 collectively reflect the influence of international environmental norms. The National Green Tribunal, established in 2010, is itself a product of India’s commitment to principles articulated at Rio – particularly the principle of effective access to judicial and administrative proceedings for environmental matters, enshrined in Principle 10 of the Rio Declaration.

The Indian Supreme Court has been particularly influential in translating soft international norms into binding domestic obligations. In M.C. Mehta v. Union of India (the Taj Trapezium Case, 1996), the Court applied both the precautionary principle and the polluter-pays principle to order industries in the vicinity of the Taj Mahal to either switch to cleaner fuels or relocate – making the first major judicial use of the precautionary principle in India. The Court also recognised, in N.D. Jayal v. Union of India, that adherence to sustainable development is a sine qua non for the maintenance of the symbiotic balance between the right to development and the right to ecology. These judicial interventions demonstrate that even principles originating as soft international law can become hard, enforceable obligations when courts adopt and apply them.

Beyond Rio: the continuing evolution 🔗

The story of international environmental law did not end with Rio in 1992. The Johannesburg Declaration of 2002 (Rio+10) reaffirmed and built on both Stockholm and Rio, introducing the concept of sustainable development as resting on three pillars – economic development, social development, and environmental protection. The Rio+20 conference in 2012 further reinforced the green economy framework and strengthened UNEP’s institutional mandate. More recently, the Paris Agreement of 2015 on climate change represents perhaps the most significant example of soft law principles hardening into binding international obligations: the precautionary logic that has underpinned environmental law since Stockholm is now embedded in legally binding commitments to limit global warming.

What all of this reveals is that international environmental law is not a static body of rules but a living, evolving system – one that moves from aspiration to obligation over time. Declarations like Stockholm and Rio serve as the seeds from which binding obligations eventually grow, first influencing domestic legislation and judicial decisions, and then crystallising into customary international law and treaty obligations. For India, as a major developing economy with significant environmental challenges, understanding this interplay between international norms and domestic law is not just an academic exercise – it is central to how the country navigates its obligations to both development and the planet.

What do you think? Given that the Stockholm and Rio Declarations are non-binding soft law instruments, should India’s courts continue to treat the principles they contain – such as the polluter-pays principle – as legally enforceable? And with the growing climate crisis, do you think the international community’s reliance on soft law declarations is sufficient, or does the world need more binding treaties with real enforcement mechanisms?

References

1. https://www.iisd.org/articles/deep-dive/stockholm-and-birth-environmental-diplomacy
2. https://wwfin.awsassets.panda.org/downloads/session_3_4.pdf
3. https://icmglt.org/icmlibrary/declaration-of-the-united-nations-conference-on-the-human-environment-stockholm-declaration-1972-and-the-rio-declaration-on-environment-and-development-1992/
4. https://www.un.org/en/development/desa/population/migration/generalassembly/docs/globalcompact/A_CONF.151_26_Vol.I_Declaration.pdf
5. https://www.iisd.org/articles/deep-dive/stockholm-conference-legacy
6. https://www.elr.info/sites/default/files/files-pdf/india_update_2013_01_vol3_issue3_web.pdf
7. https://blog.ipleaders.in/the-concept-of-polluter-pays-and-its-potential-in-india/
8. https://en.wikipedia.org/wiki/Soft_law
9. https://www.americanbar.org/groups/public_education/publications/insights-on-law-and-society/volume-19/insights-vol–19—issue-1/international-environmental-law/
10. https://en.wikipedia.org/wiki/Declaration_of_the_United_Nations_Conference_on_the_Human_Environment