Definition
The principle that the present generation has an obligation to preserve the natural and cultural heritage of the earth for future generations — requiring that today's development not compromise the ability of future generations to meet their own needs and enjoy the same quality of natural resources.
Intergenerational equity is the temporal dimension of environmental justice — extending the principles of fairness across time, not just within a generation. The concept was developed by Professor Edith Brown Weiss and is the foundation of the Brundtland Commission's definition of sustainable development. It requires the present generation to: (a) conserve the diversity of the natural and cultural resource base; (b) maintain the quality of the planet such that it is passed on to future generations in no worse condition than received; and (c) provide equitable access to the legacy of past generations and conserve access for future generations. The Supreme Court in M.C. Mehta v. Kamal Nath referred to this principle in the context of protecting natural resources for posterity.
Statutory Definition
No specific statutory provision. Principle 3, Rio Declaration, 1992: 'The right to development must be fulfilled so as to equitably meet developmental and environmental needs of present and future generations.' National Green Tribunal Act, 2010 (Section 2(m)) references the need to balance the rights of the present generation with those of future generations in defining 'sustainable development.' The Supreme Court in Essar Oil Limited v. Halar Utkarsh Samiti (2004) 2 SCC 392 applied intergenerational equity to the protection of a wetland from industrial development.
Etymology & Origin
From Latin 'inter' (between) + 'generatio' (generation) + 'aequitas' (equity, fairness). Intergenerational equity is fairness 'between generations' — extending the concept of justice forward in time to include those not yet born.
Full Legal Analysis
Intergenerational Equity: Justice for the Unborn
Future generations cannot speak in court — they cannot petition, vote, or advocate for their interests. Yet every decision we make about forests, aquifers, climate, and biodiversity affects them profoundly. Intergenerational equity is the legal principle that fills this representation gap — requiring that current decision-makers hold their choices to the standard of fairness not just toward today’s citizens but toward those who will come after.
Three Obligations of Intergenerational Equity
Professor Edith Brown Weiss formulated three core obligations: (a) Conserve options: Each generation must conserve the diversity of the natural and cultural resource base — so future generations have the same range of options available to them. Extinction of species, destruction of cultural heritage, or exhaustion of non-renewable resources eliminates options that future generations can never recover. (b) Conserve quality: Each generation must maintain the quality of the environment — future generations should inherit an environment no worse than the present one. Climate change, soil degradation, water depletion all violate this obligation. (c) Conserve access: Each generation must provide its members with equitable rights of access to the legacy received from past generations — and conserve that access for future generations.
Climate Change and Intergenerational Equity
Climate change is the most significant intergenerational equity challenge: greenhouse gas emissions today will affect the climate experienced by people not yet born, for centuries. The Supreme Court of India in M.K. Ranjitsinh v. Union of India (2024) — addressing the rights of the Great Indian Bustard in the context of solar energy projects — referred to climate change as a threat requiring the Court to balance the rights of present and future generations. The Court recognised a constitutional right against the adverse effects of climate change under Articles 14 and 21.
“We did not inherit this earth from our ancestors — we borrowed it from our children. Intergenerational equity is the law of the loan: what we borrow from the future, we must repay in kind. The debt is not financial but ecological — we owe future generations the same quality of life that we enjoy.”
