Urban road pricing schemes have been designed in order to reduce externalities generated by traffic. Main impacts regard: time loss due to congestion, local pollution, noise, contribution to climate change caused by emissions of GHGs, pavement costs and road damages, increase in accidents risks, extra-fuel consumption, decrease in quality of life. Moreover road pricing schemes generate public revenues.The paper performs a comparative evaluation of the three main experiences of urban road pricing in Europe: London (in operations since 2003), Stockholm (in operations since 2007, after a period of trial in 2006) and Milan (in operations since 2008, with a shift from pollution to congestion charge in 2012). Since their launch, the schemes have been adjusted in terms of amount of charge, area of application and other features.The schemes have been able to reduce negative externalities generated by traffic, such as accidents, congestion and emissions, up to different levels. A comparative analysis of the three schemes is provided. Determinants of differences in the effectiveness of the schemes are evaluated with a particular focus on elasticity of use of private vehicles to charge.The results can be useful to design well targeted congestion charge schemes and to assess their efficacy

Nature-based solutions (NBS) offer multiple solutions to urban challenges simultaneously, but realising funding for NBS remains a challenge. When the concept of NBS for societal challenges was first defined by the EC in 2017, financing was recognised as one of the major challenges to its mainstreaming. The complexity of NBS finance has its origin in the multiple benefits/stakeholders involved, which obscures the argument for both public and private sector investment. Since 2017, subsequent waves of EU research- and innovation-funded projects have substantially contributed to the knowledge base of funding and business models for NBS, particularly in the urban context. Collaborating and sharing knowledge through an EU Task Force, this first set of EU projects laid important knowledge foundations, reviewing existing literature, and compiling empirical evidence of different financing approaches and the business models that underpinned them. The second set of EU innovation actions advanced this knowledge base, developing and testing new implementation models, business model tools, and approaches. This paper presents the findings of these projects from a business model perspective to improve our understanding of the value propositions of NBS to support their mainstreaming.

This paper critically analyses the methodologies that can be adopted to value ecosystem services (ESs) at the urban level through a literature review. While literature on ES valuation has grown in recent years, its application to urban contexts is still limited. Twenty-five papers, which include 29 different case studies, carry out an economic valuation and have undergone an in-depth analysis. The papers have been selected out of 80 papers detected through keywords. Six different valuation methodologies have been employed in the case studies. The most common ESs valued at the urban level are air quality regulation, local climate regulation, carbon sequestration and storage, and aesthetic appreciation and inspiration for culture, art, and design. The methodologies recur with different frequencies in the valuation of ESs at the urban level. Choice modeling and contingent valuation methodologies are used to value a variety of ESs, including regulating, cultural, and supporting services. Other methodologies are used to value only specific ESs. The replacement cost and damage cost avoided methodologies are used for the assessment of regulation services only; the travel cost method and contingent valuation are used for cultural services only. The results indicate that the considered valuation methodologies show different levels of appropriateness with respect to specific ES categories. Therefore, there is a need to expand the application of valuation methodologies to capture the value of all ESs provided by natural resources, in order to protect and enhance them.