JYY promotes sustainable development in all its activities, as well as through its stakeholders both locally and on the national level. Within JYY, the sustainable development sector handles and is in charge of the student union’s environmental issues and development cooperation. The sector does not have its own specialist, but the Specialist in International Affairs supports the board member responsible for sustainable development, who is primarily responsible for leading the sector.
In the field of development cooperation, JYY participates in projects organized by the National Union of University Students in Finland (SYL). Additionally, JYY supports Fair Trade.