Sabine Barthold analyses the C40 Cities Climate Leadership Group to illustrate how city networks are powerful actors in the global dissemination of eco-modernization strategies aimed at decoupling economic growth from environmental degradation. Their systematic production, transfer, and mobilization of policy models, she argues, allow the organization to set technical and political norms that push the global environmental discourse in a direction where dissenting voices and differing socio-environmental imaginaries become systematically excluded.