What Is Intergenerational Justice?

Direct Answer

Intergenerational justice concerns what people living now owe to people of the future — and, in some accounts, what we owe to those of the past. The question arises with special force in environmental and climate policy, where current decisions about emissions, resource use, public debt, and technology determine the conditions of life for generations yet unborn. The central problem is asymmetry: future generations cannot participate in our decisions, cannot consent to or protest our policies, and cannot compensate us. They are also vulnerable in a distinctive way — our present actions can close off options, deplete resources, alter the climate, and create long-lived hazards such as nuclear waste, without any possibility of their consent. Intergenerational justice asks whether obligations can exist toward people who do not yet exist, what fairness requires when the benefits of today's activity are enjoyed now while its costs fall later, and how institutions can be designed to protect the interests of the unborn.

Historical Context

The modern philosophical discussion begins with John Rawls's A Theory of Justice (1971), which argued that each generation must follow a "just savings principle" — saving a fair share of resources and capital for the next generation, neither consuming everything nor demanding impossible sacrifices. Derek Parfit's Reasons and Persons (1984) then posed the "non-identity problem": because the identities of future people depend on our choices, most of the people who would exist under a harmful policy would not exist under a better one, so it is hard to say that a policy harms any particular future individual. The Brundtland Report (1987) gave the political discussion its language — "sustainable development" as meeting present needs without compromising future generations. In the 1990s and 2000s, the climate debate made intergenerational questions urgent, as economists debated the social discount rate — how much to value harms in 2100 versus today — and philosophers developed theories of intergenerational fairness, including sufficientarianism (future people are owed enough) and the ethics of "leaving no one behind."

Key Issues & Debates

The non-identity problem asks whether we can wrong future people if our actions change who exists; responses range from denying the problem to reframing wrongness in terms of the quality of lives rather than identity. The discounting debate is practical and consequential: the Stern Review argued for near-zero discounting, making aggressive mitigation rational, while critics such as William Nordhaus argued for market-based discount rates that justify much slower action — the difference is worth trillions of dollars and degrees of warming. The just savings question asks how much each generation must invest or preserve; Rawlsian, sufficientarian, and egalitarian answers differ on whether the target is equality across generations, a floor of sufficiency, or a saving rate that maximizes long-run welfare. A related question asks whether future people have rights now: some argue that beings who do not yet exist cannot hold rights, while others defend rights of future generations against present action. Institutional design is another theme: since the unborn have no vote, philosophers and policymakers propose future-generations commissioners, parliamentary committees for the future, and constitutional constraints on long-term harms. Finally, the past enters the picture through historical injustice — reparations for slavery, colonialism, and past emissions.

Contemporary Relevance

In 2026, climate policy is the paradigmatic intergenerational issue: today's emissions lock in warming, sea-level rise, and extreme weather for centuries, and the question of what the present owes the future is the question of climate policy itself. Youth climate movements and lawsuits — most famously the American case Juliana v. United States — argue that government policies violate the rights of the young and unborn. Long-term public debt, pension systems, nuclear waste disposal, and biodiversity loss pose parallel intergenerational questions. Countries are experimenting with institutions: Finland's Committee for the Future, Wales's Future Generations Commissioner, and long-term climate strategies under the Paris Agreement. The rise of artificial intelligence and debates about existential risk add a further dimension: whether the present generation may gamble with the lives of all future generations.

Related Concepts

Intergenerational justice connects to climate ethics, environmental justice, distributive justice, and the theory of justice generally. It draws on the social contract tradition, on the ethics of responsibility, and on population ethics and longtermism, and it is increasingly central to debates about sustainability and institutional design.

Further Learning

• Stanford Encyclopedia of Philosophy, "Intergenerational Justice" — https://plato.stanford.edu/entries/justice-intergenerational/
• Stanford Encyclopedia of Philosophy, "Climate Justice" — https://plato.stanford.edu/entries/justice-climate/
• John Rawls, A Theory of Justice (Cambridge, MA: Harvard University Press, 1971).