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Cities across the globe recognise their role in climate mitigation and are acting to reduce carbon emissions. Knowing whether cities set ambitious climate and energy targets is critical for determining their contribution towards the global 1.5°C target, partly because it helps to identify areas where further action is necessary. This paper presents a comparative analysis of the mitigation targets of 327 European cities, as declared in their local climate plans. The sample encompasses over 25% of the EU population and includes cities of all sizes across all Member States, plus the UK. The study analyses whether the type of plan, city size, membership of climate networks, and its regional location are associated with different levels of mitigation ambition. Results reveal that 78% of the cities have a GHG emissions reduction target. However, with an average target of 47%, European cities are not on track to reach the Paris Agreement: they need to roughly double their ambitions and efforts. Some cities are ambitious, e.g. 25% of our sample (81) aim to reach carbon neutrality, with the earliest target date being 2020. 90% of these cities are members of the Climate Alliance and 75% of the Covenant of Mayors. City size is the strongest predictor for carbon neutrality, whilst climate network(s) membership, combining adaptation and mitigation into a single strategy, and local motivation also play a role. The methods, data, results and analysis of this study can serve as a reference and baseline for tracking climate mitigation ambitions across European and global cities. Highlights• 78% of cities have a mitigation plan with targets (avg. 47% GHG reduction)• Only 25% of cities strive for carbon neutrality, most by 2050, avg. by 2045 • 90% of cities striving for carbon neutrality are members of a climate network • Ambition is driven by city size, climate networks, M-A combination, local motivation • European cities must double their ambitions to meet the aims set by the Paris Agreement

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Car CO 2 regulation effective policy to reduce transport CO 2 emissions. Learning rate above 12.5% can lead to sharp increase in electric vehicle deployment. Electric vehicles can foster the deployment of variable renewable electricity. Policies for other modes needed to curb transport CO 2 growth. a b s t r a c tWe analyse the impact of the current and an alternative stricter EU CO 2 car legislation on transport related CO 2 emissions, on the uptake of electric vehicles (EV), on the reduction of oil consumption, and on total energy system costs beyond 2020. We apply a TIMES based energy system model for Europe. Results for 2030 show that a stricter target of 70 g CO 2 /km for cars could reduce total transport CO 2 emissions by 5% and oil dependence by more than 2% compared to the current legislation. The stricter regulatory CO 2 car target is met by a deployment of more efficient internal combustion engine cars and higher shares of EV Total system costs increase by less than 1%. The analysis indicates that EV deployment and the decarbonisation of the power system including higher shares of variable renewables can be synergistic. Our sensitivity analysis shows that the deployment of EV would sharply increase between 2020 and 2030 at learning rates above 12.5%, reaching shares above 30% in 2030. Finally, the study highlights that, besides legislating cars, policies for other transport sectors and modes are needed to curb transport related CO 2 emission growth by 2030.