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In recent years, population aging has been recognized as an emerging challenge in many parts of the world. Earlier studies discussed its impacts on the sustainability of social security systems and national economic growth; however, they tended to focus on the issues at the national level and were limited to developed countries. With the knowledge that population aging will be a predominant trend in both developed and developing countries, this paper aims to: (i) describe the global population aging trend and its regional demography; (ii) provide a structural review of population aging challenges at the national, communal and individual levels; and (iii) elaborate future research topics on population aging with a particular emphasis on developing countries. Several indicators suggest rapid population aging in the coming decades, especially in Asia, Latin America and Africa. The structural review presents the diverse challenges that affect both young and older population groups. Finally, the need for linking population aging with the sustainable development concept and the possible rural decline caused by rapid urbanization are suggested as future research topics. Further studies to establish a body of knowledge on population aging in developing countries are required to place population aging on the agenda of future sustainable development discussions.

Environmental education is essential in the diffusion of the ethics, values, and skills that are critical to sustainable transformations. This paper presents the experience of non-formal environmental education approaches held in schools in the Petrópolis region of Rio de Janeiro, Brazil between 1997–2016. This paper adds to the literature on the relevant approaches and effectives of non-formal environmental education, especially in the vulnerable areas of low and middle-income regions that face critical environmental challenges. Specifically, to set up the context, this paper intends to firstly convey the commonly identified environmental sustainability challenges that the communities of the Petrópolis region are facing. Secondly, this report aims to convey key insights on how non-formal environmental education practices can strengthen gardening skills, environmental ethics, and sustainable food practices. These approaches have the potential to enhance the capacity of students toward sustainable transformations through encouraging them to be engaged with local social-environmental challenges. This paper adds new insights to the growing literature on non-formal environmental education, and it is hoped to inspire new educational approaches among sustainability educators.

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Environmental education is shaped in response to societal and environmental realities and it reflects new interests and demands that enable sustainable transformations. In recent years, the concept of resilience has taken an increasingly significant role among practitioners, researchers, policymakers, and especially within the Sustainable Development Goals (SDGs). Despite its growing importance, the literature surrounding the concept of resilience has struggled to find a consensus on definitions and measurements and therefore may be easily misconceived. In this avenue, a consensus among varying perspectives of resilience may be better achieved by understanding the interaction between students' prior knowledge (pre-conception) of resilience and the knowledge provided by educators. Based on the case study of five courses that teach the concept of this paper firstly identifies and discusses three common misconceptions among students, focusing on the concept of socio-ecological resilience. These include misconceptions to the value judgment, adaptability, and the costs that are relevant to the concept of resilience. Secondly, this paper discusses educational tools derived from scenario planning and theoretical foundations underlying empirical approaches to the concept of resilience, which may benefit educators in enabling critical thinking to address such common misconceptions. This paper may contribute to ongoing discussions in the environmental education literature, specifically to both pedagogy and curriculum focusing on the concept of resilience.