We are stripping the planet of resources faster than it can replenish them. That's the physical half of the sustainability problem.

The other half is cultural. Our psychological needs for connection, autonomy and competence run into evolved and culturally reinforced mechanisms for exclusion, competition and control. A society can be ecologically sustainable and still be psychologically unsustainable — depleting people the way it depletes soil. Both need to be tracked, not just one.

The Doughnut: A Floor and a Ceiling

Doughnut Economics, developed by economist Kate Raworth, gives us a way to hold both at once. It sets two boundaries: a social foundation — the minimum everyone needs to live with dignity (food, water, health, education, equity, political voice) — and an ecological ceiling, the planetary limits we can't safely exceed (climate stability, biodiversity, fresh water, and more). The goal isn't maximum growth in either direction. It's staying in the space between the two: meeting human need without overshooting what the planet can sustain.

The UN's Sustainable Development Goals, adopted in 2015, define much of that social foundation in practical terms. We treat them as a floor to meet, not a ceiling to aim for — the ecological limits above are just as binding as the social minimums below.

Sustainable Development Goals

• Goal 1. End poverty in all its forms everywhere
• Goal 2. End hunger, achieve food security and improved nutrition and promote sustainable agriculture
• Goal 3. Ensure healthy lives and promote well-being for all at all ages
• Goal 4. Ensure inclusive and equitable quality education and promote lifelong learning opportunities for all
• Goal 5. Achieve gender equality and empower all women and girls
• Goal 6. Ensure availability and sustainable management of water and sanitation for all
• Goal 7. Ensure access to affordable, reliable, sustainable and modern energy for all
• Goal 8. Promote sustained, inclusive and sustainable economic growth, full and productive employment and decent work for all
• Goal 9. Build resilient infrastructure, promote inclusive and sustainable industrialization and foster innovation
• Goal 10. Reduce inequality within and among countries
• Goal 11. Make cities and human settlements inclusive, safe, resilient and sustainable
• Goal 12. Ensure sustainable consumption and production patterns
• Goal 13. Take urgent action to combat climate change and its impacts*
• Goal 14. Conserve and sustainably use the oceans, seas and marine resources for sustainable development
• Goal 15. Protect, restore and promote sustainable use of terrestrial ecosystems, sustainably manage forests, combat desertification, and halt and reverse land degradation and halt biodiversity loss
• Goal 16. Promote peaceful and inclusive societies for sustainable development, provide access to justice for all and build effective, accountable and inclusive institutions at all levels
• Goal 17. Strengthen the means of implementation and revitalize the global partnership for sustainable development

Source: https://sdgs.un.org/2030agenda

Where the Cultural Thread Continues

The social foundation above covers material and structural minimums — but the psychological needs named at the start of this page (connection, autonomy, competence) are shaped just as much by how a community is structured as by what it provides. That's the territory the Well-being page takes further, through Self-Determination Theory and the Social Determinants of Health.