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Cities representing more than one third of the EU population have already developed their mitigation action plans with the support of the Covenant of Mayors initiative. This study digs into the drivers leading European cities in setting ambitious GHG reduction targets by 2030. A total number of 246 local action plans, accepted in the Covenant of Mayors initiative, were evaluated, and ambitious municipalities (with reduction targets over 50%) were compared against those committing to regular targets (40–50%). Results show that the key factor enabling a higher climate ambition in cities is to develop local mitigation actions in line with the results of the baseline emission inventory, focusing on implementing actions in the most emitting sectors of activity. Furthermore, the study reveals the abilities of specific cities to set highly ambitious mitigation targets: to municipalise energy facilities increasing renewable energy production, and to be able of developing mitigation actions even tackling highly emitting sectors (e.g., transport) that traditionally are not under the competence of local governments. The study also shows other easy-to-reach solutions that every local authority can take into account to increase its ambition such as developing in-house action plans and conducting a deep stakeholder engagement and participatory processes from the initial stage of the action plan development. • To develop local action plans aligned with the baseline emission assessment. • To increase the share of renewables by signing agreements with energy utilities. • To develop in-house action plans and to conduct participatory process. [ABSTRACT FROM AUTHOR]

How to ensure success for climate change mitigation policies? For the past decades, local climate action has been amongst the main global priorities. The Covenant of Mayors initiative is a major example of bottom-up climate initiative gathering municipalities of all sizes towards GHG reduction under a harmonised framework. Now, after the end of the first phase of the initiative in 2020, would be the time to assess the impact and effectiveness of the planed actions, based on the results of the monitoring exercise. However, the level and quality of monitoring reported by participating municipalities was not as expected and required an initial deep analysis. This study investigates the reasons behind this low number by comparing statistically the action plans of the 1643 CoM municipalities monitoring their emissions against the 3411 municipalities not doing it. The paper describes how, despite technical and financial barriers, key factors such as the direct involvement of local staff, stakeholders in participatory processes from an early stage, accurate budget allocation, or the development of the plan and deployment of actions as soon as possible, enabling municipalities to track and monitor their progress towards their climate target. • Assessing CoM impact is challenging due to the lack of monitoring/progress reports. • The lack of monitoring is explained by technical and financial barriers. • Direct engagement of local staff and stakeholders is key for successful monitoring. • Barriers and drivers found are a valuable guidance for global climate actors. [ABSTRACT FROM AUTHOR]