Realising transformative agendas in cities through mainstreaming urban nature-based solutions

Abstract

Cities are at the forefront of sustainability agendas, especially as places to implement the solutions needed to address key sustainability challenges. City-level governments have responded in diverse ways to these challenges, including adopting and implementing a mix of policies to improve resilience and liveability that address issues including heat mitigation, water security, and climate risks. To support such sustainability strategies, we argue that mainstreaming, as a process of embedding novel thinking and solutions into governance and practice, urgently needs to be comprehensively understood and leveraged. Therefore, drawing on a mix of empirical and theoretical research and focusing on the mainstreaming of nature-based solutions in urban planning, we examine and systematically conceptualise mainstreaming as a governance and planning process. Drawing on a recent case study of urban forestry governance across metropolitan Melbourne, Australia, we show how the identified drivers and mechanisms of mainstreaming can be successfully applied. The resulting framework emphasises the need for a dynamic understanding of mainstreaming processes and what ensures they can be enabled and accelerated in the governance and planning of cities. Further, this framework may be applied for mainstreaming urban nature-based solutions as well as other sustainability innovations.