Green Lines Institute for Sustainable Development is a Non Governmental Organization (NGO) that acts in the broad area of sustainable development. Its intervention encompasses scientific research, training and dissemination events. International cooperation with other similar organisations, universities, scholars and researchers is one of Green Lines courses of action.

Green Lines main activities are:
- organisation of international scientific events (seminars, conferences, workshops);
- publication of books, proceedings of conferences and scientific journals;
- research projects focused on sustainable development, shared with other similar organisations and universities;
- raining programs (mainly post-grad) focused on sustainability and sustainable development.

Green Lines aims at achieving a positive and intervening action, promoting the principles of sustainable development both at the socio-cultural level and at the level of development and cooperation.