01 Foundations of Sustainability
Explore sustainability, the principles and milestones that shaped sustainable development, and how the 17 Sustainable Development Goals connect across environmental, social, and economic priorities.
Meaning and dimensions
is the capacity of people and natural systems to endure and flourish over time. puts this idea into practice by meeting human needs and improving well-being while maintaining the environmental and social conditions that make those gains possible.
A widely used definition, set out by the World Commission on Environment and Development in Our Common Future (1987), describes development that meets present needs without compromising future generations’ ability to meet their own. This definition emphasizes fairness both among people living today and between present and future generations.
Three connected dimensions
integrates three interdependent dimensions:
Environmental: Protect ecosystems, biodiversity, climate stability, and natural resources.
Social: Support health, education, human rights, inclusion, and fair opportunities.
Economic: Enable livelihoods and prosperity over the long term.
These dimensions are not separate boxes to check. For example, a clean-energy project may reduce pollution and create jobs, but its benefits are less sustainable if local communities are excluded from decisions or bear disproportionate costs. The 2030 Agenda describes the dimensions as balanced and integrated.
Principles for decisions and policy
Several principles help translate into decisions and public policy. Together, they guide how needs, impacts, responsibilities, and decision-making are considered.
: Meet essential needs now while protecting future generations’ options, and consider how benefits and burdens are shared among people today.
: Consider social, economic, and environmental effects together. A decision that improves one dimension while causing serious harm in another may not be sustainable.
: When there is a credible threat of serious or irreversible environmental harm, lack of complete scientific certainty is not, by itself, a reason to postpone cost-effective preventive action.
: As a general policy principle, those responsible for pollution should bear its costs rather than shifting them entirely to the public.
Participation and accountability: People affected by decisions should have meaningful opportunities to contribute, and institutions should be answerable for results.
: All countries share responsibility for protecting the global environment, while their contributions to environmental problems and their capacities to respond differ.
Milestones in global cooperation
International milestones built a shared framework for environmental action and over several decades.
1972 — Stockholm Conference: The first major UN conference focused on the human environment. Its declaration and action plan elevated environmental issues in international policy, and the conference led to the creation of the UN Environment Programme (UNEP).
1987 — Our Common Future: The World Commission on Environment and Development report popularized the widely used definition of and linked environmental protection with human needs and development.
1992 — Rio Earth Summit: Governments adopted the Rio Declaration and Agenda 21, a broad action plan. The summit also advanced international agreements on climate change and biological diversity.
2000 — Millennium Development Goals (MDGs): The UN adopted eight goals focused on reducing extreme poverty and improving development outcomes by 2015. They helped shape the later global goals.
2002 — Johannesburg Summit: Governments renewed commitments to and emphasized implementation, partnerships, and practical action on issues including water, energy, health, and agriculture.
2012 — Rio+20: The conference outcome, The Future We Want, launched the process of developing a new set of global .
2015 — 2030 Agenda and : UN Member States adopted a universal agenda with 17 goals and 169 targets. That same year, they adopted the Paris Agreement on climate change.
The
The (SDGs) apply to every country and are designed to be linked and pursued together. Adopted as part of the 2030 Agenda, their scope ranges from basic needs and equality to environmental protection and international cooperation.
No Poverty
Zero Hunger
Good Health and Well-Being
Quality Education
Gender Equality
Clean Water and Sanitation
Affordable and Clean Energy
Decent Work and Economic Growth
Industry, Innovation and Infrastructure
Reduced Inequalities
Sustainable Cities and Communities
Responsible Consumption and Production
Climate Action
Life Below Water
Life on Land
Peace, Justice and Strong Institutions
Partnerships for the Goals
The goals are not a checklist of isolated projects. Expanding renewable energy, for instance, can support climate action, decent work, and healthier communities. Planning also needs to consider affordability, access, and impacts on land and ecosystems. The goals provide shared direction, while countries and communities adapt actions to local needs and circumstances.