Environment & Planning. C: Government and Policy. 31(6):971-987. ↑ Björn-Ola Linnér and Henrik Selin The Thirty Year Quest for Sustainability: The Legacy of the 1972 UN Conference on the Human Environment, Paper presented at Annual Convention of International Studies Association, Portland, Oregon, USA, February 25 – March 1, 2003, as part of the panel “Institutions and the Production of Knowledge for Environmental Governance” (co-author Henrik Selin).p.