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Life cycle engineering (LCE) targets product development and manufacturing activities in a life cycle perspective, with the aim to create more sustainable solutions. Coined approximately 30 years ago, it was adopted by the International Academy for Production Engineering (CIRP, from the French title), which established annual conferences on life cycle engineering to further develop the concept and its operationalisation. With the recent advent of the United Nations' Sustainable Development Goals (SDGs), engineering is now provided with specific targets to steer societies towards sustainable production and consumption. But how can LCE contribute to meeting the UN SDGs? Here, we report on a consultation process conducted as part of the 25th CIRP LCE conference, organised in Copenhagen, DK, in 2018. Approximately 175 participants reflected on a list of ten pre-identified challenges for implementing the SDG agenda that LCE could help tackle, and were solicited to propose solutions. A total of 118 solutions were proposed, and the main messages and recommendations are summarised and reported in the paper. Overall, they voice the need for stronger action from academia (e.g. research needs related to addressing trade-offs across SDGs), business and governments (e.g. transparent and harmonised reporting on sustainability performances, internalisation of external costs) and society at large (e.g. consumer behaviour, role of education). • Experts were consulted on how life cycle engineering can contribute meeting the UN SDGs. • An interactive session was organised in an international LCE conference. • Solutions to pre-defined challenges to achieve SDGs were proposed by 175 participants. • Specific key messages from the proposed solutions are reported here. [ABSTRACT FROM AUTHOR]

With nearly 70% of the world population expected to live in cities by 2050, assessing the sustainability of urban systems, both existing and future ones, is becoming increasingly relevant. Making cities more sustainable is a global priority, which is highlighted by 'Sustainable Cities and Communities' being listed as one of the Sustainable Development Goals (SDG) adopted by United Nations Member States in 2015. This Virtual Special Issue (VSI) explores the implementation and assessment of policies and technologies that contribute to the transition to a sustainable, energy efficient and regenerative society. We organized the issue according to four main research themes: 1) Renewable Energy Systems (i.e., different types of systems, qualitative assessments and public acceptance); 2) Sustainable Built Environment (which includes construction, operation and refurbishment); 3) Multi-Scale Models (considering urban sustainability transition from building to districts, or cities and regions to multi-country comparisons and their scaling across different countries); and 4) Governance and Policy (climate change mitigation and adaptation plans/policies that are reported across countries, urban services and infrastructures). This paper serves two purposes. The first is to provide an analysis about patterns, correlations and synergies found across the different topics that have been addressed over the last 20 years in the literature about cities' sustainability paths. A bibliometric analysis and a contingency matrix show the degree of correlation between scientific journals and main topics addressed by published articles. Secondly, the paper acts as an Editorial to the VSI, introducing the wealth of research articles and topics included in it. Both the bibliometric analysis and the papers published in this VSI demonstrate the interconnectedness of energy consumption, pollutant emissions and the competition for finite resources. The aim is to present advances and challenges of this exciting and ever-evolving research field to inform and guide future studies of urban sustainability. • We carried out a bibliometric analysis of the literature using the Cortext Manager platform· Using network analysis of a corpus of paper spanning 20 years we identified 8 major clusters. • The paper serves also as editorial for a virtual special issue dealing with urban sustainability pathways. • The virtual special issue is organised in four main themes, which touch upon different Sustainable Development Goals. [ABSTRACT FROM AUTHOR]