1. Current challenges to the concept of sustainability
2. UNOOSA (2019c). Space supporting the Sustainable Development Goals: how space can be used in support of the 2030 Agenda for Sustainable Development. Retrieved from https://www.unoosa.org/oosa/en/ourwork/space4sdgs/index.html.
3. United Nations (2015). Sustainable Development Goals: 17 goals to transform our world. Retrieved from http://www.un.org/sustainabledevelopment/sustainable-development-goals.
4. United Nations (1966). Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space, including the Moon and Other Celestial Bodies. Retrieved from https://www.unoosa.org/pdf/gares/ARES_21_2222E.pdf.
5. Planetary boundaries: Guiding human development on a changing planet