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Sustainable development goals and the climate change agenda are becoming widely promoted topics of research for the 21st century. The role of cities is increasingly recognised as central to investigating these topics. Yet, the field of informal sector entrepreneurship which so many urban entrepreneurs in developing countries depend upon is seldom considered. To redress this imbalance, this study aims to develop a decision model in accordance with institutional theory (IT) and resource dependency theory (RDT) for city managers to deploy. The model identifies and prioritises optimal strategies to address the three areas of sustainability requirements environment society and economy within the study context of Bangladesh.

This study used a mixed methods research design. In the qualitative part, the authors identified the three areas of sustainability requirements (i.e. environment, society and economy) and their corresponding strategies involving the informal sector that operates within the urban environment. In the quantitative part, the authors applied fuzzy quality function deployment (QFD) integrated with the 0-1 non-linear optimisation technique to identify optimal strategies.

The findings show that strategies such as legitimate frameworks, waste management, allocation of urban public space and training programs contribute in important ways to the three areas of sustainability requirements.

The proposed decision model will assist policy-makers and city managers to prioritise sustainability requirements and implement optimal strategies to address those requirements.

Through the integration of IT and RDT, the decision model developed in this study is unique in its application to urban-based informal entrepreneurship in the context of developing countries. The effective application of the fuzzy QFD approach and the optimisation model in the context of urban-based informal entrepreneurship also offers unique contributions to the field of study.

Gas flaring is a crucial issue in the energy transition era, as it is a major source of carbon emissions in the gas production chain. The reduction of flaring could potentially contribute to eliminating energy poverty, as the amount of gas currently flared each year could power the entirety of Sub-Saharan Africa. Despite Iran's zero-clearing target, the country ranks third in gas flaring globally, with 12% share. This case study examines the reasons behind gas flaring in Iran within the Sustainable Development Goals framework. The study reveals that while technological and economic difficulties were the primary obstacles in early years, policy malfunctioning has demonstrated the wicked nature of a sustainability problem in recent years. The traditional top-down institutional structure has led to interference from public agencies and Operations and Maintenance (O&M) companies, complicating decision-making. The lack of precise criteria for finding best solutions, as well as the absence of appropriate control and monitoring mechanisms, has further paralyzed efforts to reduce flaring. The intensification of conflict between interest groups has added complexity to the situation. The issue has been further complicated at higher levels due to economic sanctions. This study offers practical solutions for reducing flaring in Iran based on global experiences and policies and programs of some selected countries. These suggestions address the policy, technological, and institutional aspects of the problem and aim to pave the way for sustainable and responsible energy transition. By reducing gas flaring, Iran can contribute to global efforts to mitigate climate change and create a more equitable and sustainable energy future.