South Asia Sustainability Hub & Knowledge Network (SASH&KN) is a joint initiative of TRCSS, JNU and STEPS Centre. The particular lens of the Sustainability Hub for South Asia would be that of issues relevant to the livelihoods and health of informal sector workers and the marginalised majority in the region. Pathways to sustainability will be charted through local, national, regional and global studies on people’s responses to the ecosystem, livelihood and health challenges, diverse science and technology possibilities, regulatory and governance mechanisms as well as economic and political processes. Creating a knowledge repository as a resource on sustainability, and developing an enlarging network of collaborative institutions, is envisaged so that the Hub also acts as a source for policy intervention and response in public discourse.