Defining and measuring progress in adaptation are important questions for climate adaptation science, policy, and practice. Here, we assess the progress of urban adaptation planning in 327 European cities between 2005 and 2020 using three ‘ADAptation plan Quality Assessment’ indices, called ADAQA-1/ 2/ 3, that combine six plan quality principles. Half of the cities have an adaptation plan and its quality significantly increased over time. However, generally, plan quality is still low in many cities. Participation and monitoring and evaluation are particularly weak aspects in urban adaptation policy, together with plan ‘consistency’. Consistency connects impacts and vulnerabilities with adaptation goals, planned measures, actions, monitoring and evaluation, and participation processes. Consistency is a key factor in the overall quality of plans. To help evaluate the quality of plans and policies and promote learning, we suggest incorporating our ADAptation plan Quality Assessment indices into the portfolio of adaptation progress assessments and tracking methodologies.

Fossil fuels in transportation are a significant source of local emissions in and around cities; thus, decarbonising transportation can reduce both greenhouse gases (GHGs) and air pollutants (APs). However, the degree of these reductions depends on what replaces fossil fuels. Today, GHG and AP mitigation strategies are typically ‘decoupled’ as they have different motivations and responsibilities. This study investigates the ancillary benefits on (a) APs if the transport sector is decarbonised, and (b) GHGs if APs are drastically cut and (c) the possible co-benefits from targeting APs and GHGs in parallel, using an energy-system optimisation model with a detailed and consistent representation of technology and fuel choices. While biofuels are the most cost-efficient option for meeting ambitious climate-change-mitigation targets, they have a very limited effect on reducing APs. Single-handed deep cuts in APs require a shift to zero-emission battery electric and hydrogen fuel cell vehicles (BEVs, HFCVs), which can result in significant upstream GHG emissions from electricity and hydrogen production. BEVs powered by ‘green’ electricity are identified as the most cost-efficient option for substantially cutting both GHGs and APs. A firm understanding of these empirical relationships is needed to support comprehensive mitigation strategies that tackle the range of sustainability challenges facing cities.

Knowledge transfer (KT) from academia to practice is important in many fields, but comprehensive studies on identifying the most effective forms of KT are scarce. This paper aims to provide an overview of KT theory and presents a cross-disciplinary scoping review of empirically oriented peer-reviewed articles. The review offers guidance for researchers seeking to communicate effectively with practitioners. It explores the effects of research communications, delves into the understanding and measurement of these effects, attempts to identify the most effective forms of communication, and highlights important considerations when designing KT strategies. Few studies in our sample (eight of 27) systematically measured effects of KT, and merely four studies compared multiple forms of KT. Nevertheless, most studies estimated effects from KT, regardless of the chosen form (e.g., workshops or lectures). Most studies estimated knowledge change as the primary outcome. Additionally, several studies explored altered beliefs such as increased self-efficacy. A third of the studies addressed how the knowledge was applied, ranging from sharing information to developing new habits. The identified effects were, however, both small and volatile. Our findings underscore the significance of continuity and repeated interactions to enhance the impact of KT initiatives. Furthermore, researchers need to develop a comprehensive set of tools to facilitate successful KT, considering factors such as expertise, communication skills, trust-building, and participant-centered approaches. By employing these strategies, researchers can effectively bridge the gap between academia and practice, facilitating successful KT in various fields.