Constitutional Environmental Law: Constitutional Protection of the Environment in India — Complete Note

The Constitution of India as originally enacted said nothing about the environment. Today it is the strongest source of environmental protection in the country. That transformation came from two directions: the Forty-second Amendment of 1976, which added a directive to the State (Article 48A) and a duty on every citizen (Article 51A(g)); and the Supreme Court, which read a right to a healthy environment into Article 21, used Articles 14 and 19 to discipline governmental and commercial action, and used Articles 32, 136, 142 and 226 to give those rights effective remedies. This note covers the whole of that constitutional scheme.

1. The Constitutional Scheme in Outline

Constitutional environmental law rests on five pillars, which the rest of this note develops in turn:

1. A right: the right to a healthy environment as part of the right to life (Article 21), supported by Articles 14 and 19.
2. A directive to the State: to protect and improve the environment (Article 48A), with related directives in Articles 39(b), 47 and 49.
3. A duty on every citizen: to protect and improve the natural environment and to have compassion for living creatures (Article 51A(g)).
4. Remedies: the writ jurisdiction of the Supreme Court and High Courts (Articles 32 and 226), special leave (Article 136) and the power to do complete justice (Article 142).
5. A federal distribution of power: legislative entries in the Seventh Schedule, and the special powers of Parliament under Articles 252 and 253.

2. Article 21 and the Right to a Healthy Environment

2.1 How the right was derived

The environmental reading of Article 21 was made possible by the expansive interpretation of 'life' that followed Maneka Gandhi v. Union of India (1978). In Francis Coralie Mullin v. Administrator, Union Territory of Delhi (1981) the Supreme Court held that the right to life means the right to live with human dignity and all that goes with it, including the bare necessaries of life. A life of dignity is impossible in poisoned air or water, and from there the environmental right followed.

The High Courts took the first steps. In T. Damodhar Rao v. Special Officer, Municipal Corporation of Hyderabad, AIR 1987 AP 171, the Andhra Pradesh High Court held that environmental pollution would amount to a violation of Article 21. In L.K. Koolwal v. State of Rajasthan, AIR 1988 Raj 2, the Rajasthan High Court treated the insanitary conditions of Jaipur as a violation of Article 21 and read Article 51A(g) as giving citizens the right to seek its enforcement. The Supreme Court had already acted on the right in Rural Litigation and Entitlement Kendra v. State of U.P. (1985) without stating it expressly, and stated it plainly in 1991.

2.2 Right to a pollution-free environment

The right to a pollution-free environment is the broadest formulation of the Article 21 right. In Chhetriya Pardushan Mukti Sangharsh Samiti v. State of U.P., (1990) 4 SCC 449, the Court recognised that every citizen has a fundamental right to the enjoyment of quality of life and living as contemplated by Article 21. In Virender Gaur v. State of Haryana, (1995) 2 SCC 577, it held that environmental, ecological, air and water pollution amount to a violation of Article 21, and that a hygienic environment is an integral facet of the right to healthy life. The right does not mean zero pollution; it means pollution within limits that do not endanger life and health, which is why it is enforced through statutory standards.

2.3 Right to clean air

The right to clean air has been enforced most visibly in Delhi. In the vehicular pollution litigation (M.C. Mehta v. Union of India) the Supreme Court directed in 1998 that Delhi's buses and public transport switch to compressed natural gas, and enforced the direction against official resistance in 2002. Later orders have concerned the phasing out of old diesel and petrol vehicles, the use of firecrackers (Arjun Gopal v. Union of India, 2017 and 2018, including the direction to use only 'green' crackers), and stubble burning in neighbouring States. In Murli S. Deora v. Union of India, (2001) 8 SCC 765, the right was applied to passive smoking in public places, and in Noise Pollution (V), In re, (2005) 5 SCC 733, to freedom from excessive noise, which the Court described as a form of atmospheric pollution. Parliament's response to the air quality crisis of the National Capital Region was the Commission for Air Quality Management Act, 2021.

2.4 Right to clean water

The right to clean water includes both freedom from pollution of water sources and access to safe drinking water. In Narmada Bachao Andolan v. Union of India, (2000) 10 SCC 664, the Court described water as a basic need for the survival of human beings and part of the right to life. In A.P. Pollution Control Board II v. Prof. M.V. Nayudu, (2001) 2 SCC 62, it held that the right to access drinking water is fundamental to life and that the State has a duty under Article 21 to provide clean drinking water. In the Cauvery dispute, State of Karnataka v. State of Tamil Nadu, (2018) 4 SCC 1, the Court gave drinking water the highest priority in the allocation of river water. Earlier, the Kanpur Tanneries case (1987) and Vellore (1996) enforced the right against industries polluting the Ganga and the Palar.

2.5 Right to a safe and healthy environment

The right extends to safety from hazardous activities and to health in the working environment. The Oleum Gas case (1987) established that hazardous enterprises are absolutely liable for harm to the community. In Consumer Education and Research Centre v. Union of India, (1995) 3 SCC 42, the right to health of asbestos workers was held to be part of Article 21. In Research Foundation for Science, Technology and Natural Resource Policy v. Union of India, (2005) 13 SCC 186, concerning the import and disposal of hazardous wastes, the Court recognised that the right to information and community participation for protecting the environment and human health also flows from Article 21.

2.6 Environmental rights as part of the right to life: a synthesis

The environmental content of Article 21 can now be stated as a bundle of rights:

• the right to pollution-free air and water (Subhash Kumar);
• the right to access safe drinking water (M.V. Nayudu II);
• the right to health, including occupational health (CERC);
• the right to freedom from noise and to sleep (Noise Pollution (V));
• the right to a hygienic and sanitary environment (Ratlam; L.K. Koolwal);
• the right to information and participation in environmental matters (Research Foundation);
• the right to livelihood, which requires that environmental measures not destroy livelihoods without rehabilitation (Olga Tellis v. Bombay Municipal Corporation, 1985; Narmada);
• the right to be free from the adverse effects of climate change (M.K. Ranjitsinh, 2024).

3. Article 14 and Environmental Protection

Article 14 guarantees equality before the law and, since E.P. Royappa v. State of Tamil Nadu (1974), protection against arbitrariness. It serves environmental protection in three ways.

1. Review of arbitrary environmental decisions. A clearance, permission or relaxation granted without application of mind, in disregard of relevant considerations or contrary to the statutory scheme, is arbitrary and may be struck down.
2. Allocation of natural resources. Natural resources belong to the people and are held by the State in trust. Their distribution must be fair, transparent and non-arbitrary. In Centre for Public Interest Litigation v. Union of India, (2012) 3 SCC 1 (the 2G case), and the Natural Resources Allocation Presidential Reference, (2012) 10 SCC 1, the Court held that the disposal of natural resources must be guided by Article 14 and the common good, though auction is not the only constitutionally permissible method.
3. Equality in the burden of harm. In M.K. Ranjitsinh (2024) the Court observed that the inability of under-served communities to adapt to climate change or cope with its effects violates their right to equality, which is why Article 14, alongside Article 21, is a source of the right against the adverse effects of climate change.

4. Article 19 and Environmental Regulation

4.1 Article 19(1)(g) versus environmental restrictions

Article 19(1)(g) guarantees the right to practise any profession or to carry on any occupation, trade or business. Article 19(6) permits the State to impose reasonable restrictions on that right in the interests of the general public. Protection of the environment and of public health is plainly such an interest. The courts have consistently held that no one has a fundamental right to carry on a business in a manner that pollutes the environment or endangers the health of others.

In Abhilash Textile v. Rajkot Municipal Corporation, AIR 1988 Guj 57, the Gujarat High Court held that dyeing and printing units discharging untreated effluent onto public roads and drains could not claim protection under Article 19(1)(g), since no one may carry on business so as to cause nuisance to the public. In State of Tamil Nadu v. Hind Stone, (1981) 2 SCC 205, the Supreme Court upheld the State's refusal to renew private granite leases as a measure of conservation of natural wealth for future generations.

4.2 Reasonable restrictions on polluting industries

The following measures have been upheld as reasonable restrictions on trade and business:

• closure of tanneries that failed to install effluent treatment plants, regardless of financial hardship (M.C. Mehta v. Union of India, Kanpur Tanneries, (1987) 4 SCC 463);
• relocation of hazardous and noxious industries out of residential areas of Delhi, with compensation and continuity of employment for workers (M.C. Mehta v. Union of India, (1996) 4 SCC 750);
• mandatory switch to natural gas or relocation for industries in the Taj Trapezium Zone (M.C. Mehta v. Union of India, (1997) 2 SCC 353);
• restrictions on the manufacture, sale and use of firecrackers (Arjun Gopal);
• closure of the Sterlite copper smelter after repeated violations (Vedanta Ltd. v. State of Tamil Nadu, 2024).

A restriction must still be reasonable. It must have a rational connection with the environmental objective, go no further than necessary, and strike a fair balance between the right and the public interest, the proportionality test restated in Modern Dental College and Research Centre v. State of Madhya Pradesh, (2016) 7 SCC 353. This is why courts often prefer conditions, time-bound compliance and technological upgrades to outright closure.

4.3 Other freedoms under Article 19

Article 19(1)(a) protects speech and, through it, access to environmental information and environmental protest. It does not protect noise. In Church of God (Full Gospel) in India v. K.K.R. Majestic Colony Welfare Association, (2000) 7 SCC 282, the Court held that no religion prescribes that prayers be performed by disturbing the peace of others through loudspeakers, and that neither Article 19(1)(a) nor Article 25 protects the use of amplifiers beyond permissible limits.

5. Directive Principles and Environmental Protection

Article 48A was inserted by the Constitution (Forty-second Amendment) Act, 1976. It imposes a positive obligation on the State: not only to refrain from harming the environment but to take steps to protect and improve it. Although Article 37 makes directive principles non-justiciable, they are 'fundamental in the governance of the country', and the courts use Article 48A as an aid to interpreting statutes and fundamental rights and as a standard for reviewing governmental decisions.

5.1 Other directive principles relevant to the environment

• Article 39(b): ownership and control of the material resources of the community to be distributed to subserve the common good. Natural resources are the paradigm of such resources.
• Article 47: the State shall regard the raising of the level of nutrition and the standard of living and the improvement of public health as among its primary duties.
• Article 48: organisation of agriculture and animal husbandry on modern and scientific lines, and preservation and improvement of breeds.
• Article 49: protection of monuments and places and objects of artistic or historic interest, which links environmental and heritage protection (as in the Taj Trapezium case).
• Article 51(c): fostering respect for international law and treaty obligations, the constitutional basis for receiving international environmental principles.

5.2 Article 47 and public health

Article 47 makes public health one of the State's primary duties. Read with Article 21, it has been the basis of the right to health. In Vincent Panikurlangara v. Union of India, (1987) 2 SCC 165, the Court held that in a welfare State it is the obligation of the State to ensure the creation and sustaining of conditions congenial to good health, and that maintenance and improvement of public health rank high among its duties. In Municipal Council, Ratlam v. Vardhichand (1980) the Court enforced the statutory duties of a municipality to secure sanitation, rejecting the plea of financial inability.

5.3 Harmonising Parts III and IV

In Minerva Mills Ltd. v. Union of India, (1980) 3 SCC 625, the Supreme Court described the harmony and balance between fundamental rights and directive principles as an essential feature of the basic structure. In environmental law the harmony is exact: Article 48A describes the State's duty, and Article 21 describes the citizen's right that corresponds to it.

6. Fundamental Duties and Environmental Protection

Article 51A(g) was also inserted by the Forty-second Amendment, which introduced the fundamental duties following the recommendations of the Swaran Singh Committee. It places the duty on every citizen, not on the State. It is not directly enforceable, but it has been given legal effect in several ways.

1. Standing. In L.K. Koolwal (1988) the duty was treated as giving every citizen the right to approach the court to compel the State to perform its environmental obligations.
2. Interpretation. Courts read statutes and fundamental rights in the light of the duty. In Animal Welfare Board of India v. A. Nagaraja, (2014) 7 SCC 547, Articles 51A(g) and (h) were read with the Prevention of Cruelty to Animals Act, 1960 to protect animals from unnecessary suffering.
3. Environmental education. In M.C. Mehta v. Union of India, (1992) 1 SCC 358, the Court directed that environmental awareness be spread through cinema halls, radio and television, and that environment be taught as a subject in schools and colleges, so that citizens could perform their duty under Article 51A(g).
4. Validity of laws. A law that gives effect to a fundamental duty may be regarded as a reasonable restriction on fundamental rights. In AIIMS Students' Union v. AIIMS, (2002) 1 SCC 428, the Court emphasised that fundamental duties, though not enforceable by writ, are equally important as fundamental rights.

Other duties reinforce Article 51A(g): to develop scientific temper, humanism and the spirit of inquiry (Article 51A(h)), to safeguard public property (Article 51A(i)), and to value and preserve the rich heritage of our composite culture (Article 51A(f)). The Justice J.S. Verma Committee on the Operationalisation of Fundamental Duties (1999) identified existing laws, including environmental laws, through which the duties are given effect.

6.1 Articles 48A and 51A(g) read together

The two provisions mirror each other. Both use the phrase 'protect and improve', both refer to forests and wildlife, and both were inserted by the same amendment. Article 48A binds the State; Article 51A(g) binds the citizen. Together they show that environmental protection is a shared constitutional responsibility.

In M.K. Ranjitsinh (2024) the Court relied on the two provisions to show that the Constitution recognises the importance of the natural world, and treated them as indications of a right against the adverse effects of climate change that is secured by Articles 14 and 21.

7. Constitutional Remedies in Environmental Matters

7.1 Article 32

Article 32 guarantees the right to move the Supreme Court for enforcement of fundamental rights, and is itself a fundamental right. In environmental matters the Court has used it with great flexibility. In Bandhua Mukti Morcha v. Union of India, (1984) 3 SCC 161, it held that 'appropriate proceedings' under Article 32 are not confined to a particular form, and that letters may be treated as petitions. In the Oleum Gas case (1987) it held that the power under Article 32 includes the power to award compensation for infringement of fundamental rights. Relief has included closure and relocation of industries, appointment of expert committees, directions to authorities, continuing mandamus and environmental compensation.

7.2 Article 226

Article 226 empowers the High Courts to issue writs 'for the enforcement of any of the rights conferred by Part III and for any other purpose'. It is therefore wider than Article 32: it can be invoked to enforce statutory duties under environmental legislation, even where no fundamental right is directly engaged. Many High Courts have constituted green benches. Early decisions such as T. Damodhar Rao (1987), L.K. Koolwal (1988) and Kinkri Devi v. State of Himachal Pradesh, AIR 1988 HP 4 (limestone mining), were decided under Article 226.

7.3 Environmental public interest litigation

Public interest litigation relaxed the rule of standing so that any public-spirited person may approach the court on behalf of those who cannot, or on behalf of the environment itself (S.P. Gupta v. Union of India, 1981 Supp SCC 87). Environmental PIL has four distinctive features: epistolary jurisdiction (letters and news reports treated as petitions); a non-adversarial, problem-solving approach; reliance on expert committees and amicus curiae; and continuing supervision of compliance. The courts have also guarded against misuse. In Subhash Kumar (1991) a petition motivated by private interest was dismissed, and in State of Uttaranchal v. Balwant Singh Chaufal, (2010) 3 SCC 402, the Supreme Court laid down guidelines to prevent frivolous and motivated PILs.

7.4 Article 136

Article 136 gives the Supreme Court discretionary power to grant special leave to appeal from any judgment or order of any court or tribunal. Many environmental decisions of the High Courts reach the Supreme Court this way; Vedanta Ltd. v. State of Tamil Nadu (2024) was an appeal against the Madras High Court's decision upholding the closure of the Sterlite plant. Appeals from the National Green Tribunal lie to the Supreme Court under Section 22 of the NGT Act, 2010, a statutory appeal on the grounds specified in Section 100 of the Code of Civil Procedure, within ninety days.

7.5 Article 142

Article 142 empowers the Supreme Court to pass any decree or order necessary for doing complete justice in any cause pending before it. It has been the engine of the most far-reaching environmental orders: the continuing directions in T.N. Godavarman on forest management and net present value, the conversion of Delhi's public transport to CNG, the relocation of industries, the creation of the Central Empowered Committee, and environmental compensation in place of closure (Alembic Pharmaceuticals, 2020). The power is not unlimited. In Supreme Court Bar Association v. Union of India, (1998) 4 SCC 409, the Court held that Article 142 cannot be used to supplant substantive law or to achieve indirectly what cannot be achieved directly.

8. Federal Distribution of Environmental Legislative Powers

8.1 Article 246 and the Seventh Schedule

Article 246 distributes legislative power: Parliament has exclusive power over the Union List (List I), the State Legislatures over the State List (List II), and both over the Concurrent List (List III), with Union law prevailing in case of repugnancy (Article 254). Residuary power lies with Parliament (Article 248 and Entry 97, List I). 'Environment' is not itself an entry in any list. Its components are spread across all three.

Two features follow. First, water and land are State subjects, which is why a national water pollution law could not be enacted by Parliament under Article 246 alone. Second, the 1976 transfer of forests and wildlife to the Concurrent List enabled Parliament to enact the Forest (Conservation) Act, 1980 and to strengthen the Wild Life (Protection) Act.

8.2 Article 252: legislation by consent

Article 252 allows Parliament to legislate on a State subject if the Legislatures of two or more States pass resolutions requesting it. The law applies to those States and to any State that later adopts it. The Water (Prevention and Control of Pollution) Act, 1974 was enacted in this way, and was subsequently adopted by the remaining States. A law made under Article 252 can be amended or repealed only by Parliament, in the same manner.

8.3 Article 253: international environmental obligations

Article 253 overrides the distribution of subjects. It allowed Parliament to legislate on matters in the State List to implement the decisions of the Stockholm Conference. The Air Act, 1981 and the Environment (Protection) Act, 1986 were enacted under it, and the Biological Diversity Act, 2002 implements the Convention on Biological Diversity. India follows a dualist approach: treaties require legislation to take effect domestically (Maganbhai Ishwarbhai Patel v. Union of India, (1970) 3 SCC 400), and Article 253 is the route.

8.4 Environment and constitutional federalism

Environmental problems do not respect State boundaries. Smoke from crop-residue burning in Punjab and Haryana affects Delhi; effluents discharged in one State pollute a river in another; river waters are shared among riparian States. The Constitution responds in several ways: Article 253 and the Concurrent List entries allow uniform national standards; Article 256 requires States to comply with Union laws and Article 257 allows the Union to give directions to States; Article 262 provides for adjudication of inter-State water disputes; and central statutes such as the EPA allow the Centre to delegate powers to States (Section 23). The Commission for Air Quality Management (2021) is an example of an inter-State body created for a shared problem.

The result is a system that is formally federal but functionally centralised in environmental matters. The Union sets standards and grants the most important clearances; the States implement them through their pollution control boards and forest departments; and local bodies, under Articles 243G and 243W read with the Eleventh and Twelfth Schedules, carry out functions such as sanitation, solid waste management and social forestry. The Twelfth Schedule expressly includes 'protection of the environment and promotion of ecological aspects'. This is cooperative federalism, and its weakness lies in implementation at the State and local levels.

9. Constitutional Morality and the Environment

Constitutional morality means fidelity to the values that underlie the Constitution, not merely to its text. The Supreme Court has used the concept in Manoj Narula v. Union of India (2014), Government of NCT of Delhi v. Union of India (2018) and Navtej Singh Johar v. Union of India (2018) to require that constitutional functionaries act in keeping with the Constitution's deeper commitments.

Applied to the environment, constitutional morality supports three propositions. First, the State's duty under Article 48A and the citizen's duty under Article 51A(g) are part of the Constitution's value system, and executive action that dilutes environmental safeguards for short-term gain is inconsistent with it. Second, the Preamble's promise of justice, social, economic and political, includes justice for those who bear environmental harm, and for future generations who cannot speak for themselves. Third, the courts' reading of Article 21 to include environmental rights is itself an expression of constitutional morality: the Constitution is treated as a living document whose values must be applied to problems its framers did not foresee. The concept is best used in answers as an interpretive argument, supported by the case law, rather than as an independent ground of decision.

10. Intergenerational Rights under the Constitution

The Constitution does not mention future generations, but the Supreme Court has read intergenerational equity into it. In State of Tamil Nadu v. Hind Stone (1981) the Court said that rivers, forests, minerals and similar resources are the nation's natural wealth and that every generation owes a duty to all succeeding generations to develop and conserve them. In State of Himachal Pradesh v. Ganesh Wood Products, (1995) 6 SCC 363, it applied intergenerational equity to forest-based industry, and in Vellore (1996) it listed intergenerational equity first among the principles of sustainable development.

Comparative law has gone further. In Oposa v. Factoran (1993) the Supreme Court of the Philippines allowed children to sue on behalf of themselves and generations yet unborn to stop timber licences. In Neubauer v. Germany (2021) the German Federal Constitutional Court held that a climate law which deferred most emission reductions to the future unconstitutionally burdened the freedoms of the young. In India, a petition filed before the NGT by a nine-year-old, Ridhima Pandey v. Union of India (2019), was dismissed on the ground that climate concerns were covered by existing processes, but it brought the argument to Indian courts.

11. Climate Change and Fundamental Rights

11.1 The right against the adverse effects of climate change

11.2 Content of the climate right

The Court in Ranjitsinh identified several dimensions of the harm that climate change inflicts on fundamental rights: rising temperatures, droughts, food and water shortages, vector-borne disease and extreme weather threaten life and health under Article 21; and the unequal capacity of communities to adapt engages equality under Article 14. It also noted India's international commitments under the UNFCCC and the Paris Agreement, including its updated Nationally Determined Contribution (2022) to reduce the emissions intensity of GDP by 45 per cent from 2005 levels by 2030 and to reach about 50 per cent of installed electric power capacity from non-fossil sources by 2030, and its goal of net zero emissions by 2070.

11.3 The comparative and international context

• Leghari v. Federation of Pakistan (Lahore High Court, 2015): the government's failure to implement its climate policy violated fundamental rights to life and dignity.
• State of the Netherlands v. Urgenda Foundation (Supreme Court of the Netherlands, 2019): the State was ordered to reduce emissions by at least 25 per cent from 1990 levels by the end of 2020 to protect rights under the European Convention.
• Neubauer v. Germany (Federal Constitutional Court, 2021): intergenerational burden-sharing in climate legislation.
• Verein KlimaSeniorinnen Schweiz v. Switzerland (European Court of Human Rights, 2024): Article 8 includes a right to effective protection from the serious adverse effects of climate change.
• ICJ Advisory Opinion on the Obligations of States in respect of Climate Change (23 July 2025): States have obligations under treaty and customary international law, including a duty of stringent due diligence to prevent significant harm to the climate system, and a clean, healthy and sustainable environment is essential for the enjoyment of human rights.

12. Environmental Protection as a Constitutional Imperative

Drawing the threads together, environmental protection in India is no longer a matter of policy preference. It is a constitutional imperative, for six reasons:

1. It is a fundamental right of every person under Article 21, enforceable directly in the Supreme Court and the High Courts.
2. It is a constitutional duty of the State under Article 48A, which courts use to review governmental action.
3. It is a fundamental duty of every citizen under Article 51A(g).
4. It limits other rights: trade and business under Article 19(1)(g) yield to environmental restrictions under Article 19(6), and the allocation of natural resources is subject to Article 14.
5. It is supported by effective remedies under Articles 32, 136, 142 and 226, including PIL and continuing mandamus.
6. It extends to future generations and to the global climate, through intergenerational equity and the right against the adverse effects of climate change.

The weaknesses lie not in the Constitution but in implementation: regulators that are under-resourced, executive relaxation of safeguards, and heavy dependence on courts to do what administration should. The constitutional framework is among the most protective in the world; the challenge is to make it effective on the ground.

13. Related Topics and Provisions