Development that can last

Economic development is the process of raising people’s material and non-material standards of living. It covers health, education, freedom and economic opportunities, as well as the ability to escape poverty. Simply producing more output isn’t enough.

Sustainable development is economic development that meets present needs without reducing the ability of future generations to meet their own needs. The word “needs” is key. Development should improve life now without exhausting the natural and social foundations that later well-being depends on.

Sustainability describes a condition in which economic, social and environmental systems continue to support well-being over time. Sustainable development is the process, while sustainability is the long-term condition it aims to achieve.

The three dimensions

Governments and other economic agents need to consider three connected dimensions when pursuing sustainable development:

• Economic development: expanding access to useful goods and services, productive employment and economic opportunity.
• Social progress: improving health, education, rights and security while widening participation and inclusion.
• Environmental protection: conserving ecosystems and using renewable and non-renewable resources at rates that don’t undermine future well-being.

The dimensions often overlap. Cleaner urban transport, for example, can reduce congestion and improve productivity. It can also promote health by lowering air pollution and protect the environment by cutting emissions. Yet a policy may help one dimension while harming another. Rapid mineral extraction may generate jobs and government revenue, but it can pollute water and leave future communities with fewer resources.

Scarcity, choice and equity across generations

Scarcity exists when available resources cannot satisfy every competing want. Governments must make choices as a result. Spending on environmental protection has an opportunity cost: the value of the next-best alternative forgone. Failing to protect the environment creates future costs too, including lower agricultural productivity, poorer health and greater exposure to climate-related damage.

Intergenerational equity is the principle that benefits and burdens should be distributed fairly between present and future generations. This lies at the heart of sustainable development. Present generations should not raise their consumption by passing depleted resources, pollution and expensive environmental repairs to people who had no part in the original decision.

Sustainability also concerns fairness within the present generation. Equity is the principle of fairness in the distribution of income, opportunity and economic burdens. A conservation policy is less likely to work if low-income households bear most of its costs while the benefits go elsewhere.

Why context matters

No single policy package will suit every economy. Governments must consider income levels, administrative capacity and political institutions. Patterns of land ownership, available technology and the needs of groups that depend directly on natural resources also matter. An intervention may be technically efficient yet still fail because households cannot afford it or property rights cannot be enforced.

Economic well-being is a state in which people can meet their material needs and enjoy wider elements of a good life, such as health, security, opportunity and a satisfactory environment. Effective sustainable-development strategies seek to raise this well-being while recognising environmental limits and distributional consequences. The aim isn’t to stop economic activity. It is to change its scale, composition and methods so that improvements can endure.

A shared framework

Adopted by the United Nations in 2015 as part of the 2030 Agenda, the Sustainable Development Goals (SDGs) are 17 interconnected global objectives. They apply equally to higher-income and lower-income countries, giving governments, businesses, international organizations and civil society a common framework for coordinating action.

The 17 goals are:

1. No poverty
2. Zero hunger
3. Good health and well-being
4. Quality education
5. Gender equality
6. Clean water and sanitation
7. Affordable and clean energy
8. Decent work and economic growth
9. Industry, innovation and infrastructure
10. Reduced inequalities
11. Sustainable cities and communities
12. Responsible consumption and production
13. Climate action
14. Life below water
15. Life on land
16. Peace, justice and strong institutions
17. Partnerships for the goals

These goals bring together economic, social and environmental objectives. Goal 17 recognizes interdependence as well. Finance, technology, trade and environmental effects cross national borders, which means many sustainability problems can’t be solved by a country acting alone.

Connecting policies to goals

When explaining how an initiative supports the SDGs, trace the causal chain instead of simply naming a goal. Start with the change caused by the policy. Then explain how people benefit and why that benefit supports development that can continue over time.

Take a city that replaces heavily polluting buses with reliable low-emission public transport. The change can reduce respiratory illness, widen access to employment and lower greenhouse-gas emissions. It may therefore contribute to good health, decent work, sustainable cities and climate action. How much it contributes depends on affordability, how the electricity is generated and whether displaced workers receive support.

Restoring coastal wetlands offers another example. A programme may reduce storm damage while preserving habitats and supporting sustainable fishing and tourism. It can therefore advance climate action, life below water, life on land and decent work. One intervention often affects several goals at the same time.

Benefits, complementarities and trade-offs

Progress on one goal may strengthen another. Better nutrition can improve school attendance. Stronger education may raise productivity and earning opportunities, while higher incomes can expand the tax base available for health and environmental services. These links are complementarities between goals.

Conflicts can arise too. New infrastructure may create employment and improve market access, yet damage habitats or displace communities. Expanding renewable-energy equipment may cut emissions while increasing demand for mined materials. The key question isn’t simply whether a project produces benefits. Its overall design should advance economic well-being, equity and environmental protection together.

Governments can use spending, regulation, taxation, subsidies, public provision and international agreements. Even so, scarce finance, weak institutions, conflicting political interests and limited access to technology can restrict progress. Effective strategies need to match the social, economic and political context. The same headline goal may call for very different policies in different countries.

How poverty can place pressure on natural resources

Poverty describes a condition in which people lack enough income, assets or access to essential goods and services to achieve an acceptable standard of living. When a household faces an immediate threat to its food supply or income, it may be unable to afford long-term conservation, even if it understands why conservation matters.

Poor farmers may have no access to credit, secure land rights or irrigation. They may also lack training or access to less damaging technology. To maintain current output, farmers might repeatedly cultivate fragile land, shorten fallow periods, remove vegetation or extend farming into forests. Such choices can meet urgent needs now, but they also reduce soil fertility, increase erosion, pollute water and destroy habitats.

Forests and grazing land are often common-pool resources. Excluding users from these resources is difficult, while one person's use reduces what remains for others. When access is poorly managed, each user has an incentive to take resources before somebody else does. Over-exploitation can follow, even though all users would benefit from conserving the resource over the long term.

This relationship can reinforce itself. Poverty encourages intensive resource use, while environmental degradation reduces land productivity and household income. With less income, sustainable methods become even harder to finance.

Negative externalities and market failure

A negative externality of production is a harmful spillover from producing a good or service that imposes a cost on third parties who aren't involved in the market transaction. Land degradation and downstream water pollution can impose costs beyond the farmer or agricultural business responsible for them. The same applies to biodiversity loss and greenhouse-gas emissions.

Marginal private cost (MPC) is the additional cost to the producer of one more unit of output. Marginal external cost (MEC) is the additional cost that unit imposes on third parties. Marginal social cost (MSC) is the additional cost to society as a whole, including private and external costs. When agricultural production causes environmental harm, marginal social cost is greater than marginal private cost.

Because producers respond mainly to private costs, the market produces more than the socially efficient quantity. Those extra units cost society more than the benefit they generate, so a welfare loss occurs. This is market failure, a situation in which an unregulated market allocation does not maximize social welfare.

Why this threatens sustainability

Environmental damage harms present well-being and future productive capacity. Depleted soil reduces future harvests. Deforestation removes ecosystem services, while accumulated pollution increases future health and clean-up costs. Development through this process isn't sustainable because present survival or output is secured by weakening the ability of future generations to meet their needs.

These environmental effects can also cross borders. Habitat loss, river pollution and greenhouse-gas emissions may affect people far from the original activity. Sustainability therefore involves interdependence and may require international finance, shared environmental rules and technological cooperation.

Poverty isn't the only cause of unsustainable activity. High-income consumers and firms can cause severe environmental damage too. Poor households also shouldn't simply be blamed for responding to a lack of alternatives. The key causal point is that poverty can restrict choice, making environmentally damaging survival strategies more likely.

Breaking the link

Policies work best when they reduce poverty while changing the incentives and opportunities available to resource users. Possible interventions include affordable credit for less damaging equipment and agricultural training. Secure and equitable land rights, payments for protecting ecosystems, suitable infrastructure and alternative income sources may also help.

The details matter. Credit won't work if borrowers can't bear the risk. Conservation rules may deepen poverty when communities lose access to land without compensation, while new technology may not suit local conditions. A durable strategy must consider who bears the costs, who receives the benefits and whether institutions can implement and monitor the policy.