This essays sets out the contributions of twelve short century advocates of sustainability. The twelve are Donella Meadows (posthumously), Jorgen Randers, Dennis Meadows, Sven Erik Jorgensen, Brian D. Faith, Soren Nors Nielsen, Frederico M. Pulselli, Daniel A. Fiscus, Simone Bastianoni, Peter Victor, Rob Dietz and Dan O'Neil. Each contribution deployed various arguments to persuade humanity to engage in transformational change in a post neo-liberal world. Most proposed action plans to bring about sustainability, and suggested ways in which the transition to the sustainable society might be enacted. Each included some broad-brush thoughts on what the sustainable society might look like. And, each demonstrated the continuing influence of the Dalyan legacy, to a greater or lesser degree. learn more on SSRN