This lecture by Jamie Lorimer explores new ways of thinking and doing environmentalism that need not make recourse to nature. The diagnosis of the ‘Anthropocene’ marks the public end of the idea of nature as a pure place removed from society and revealed by natural science. This problematic idea has been central to much Western environmentalism. This lecture explores new ways of thinking and doing environmentalism that need not make recourse to nature. It focuses on the promise and pitfalls of rewilding – a novel mode of wildlife conservation – illustrated through an experiment in the Netherlands. Creative Commons Attribution-Non-Commercial-Share Alike 2.0 UK: England & Wales; http://creativecommons.org/licenses/by-nc-sa/2.0/uk/