“…An initial bibliometric analysis supports previous research results suggesting that ethical inquiry into sustainability-related issues requires a combination of methodologies from both formal and not-formal education learning, in and outside the classroom [6], [7], [8], [9]. This lines up with the conclusion of Petit et al [5], which states that in order to learn and practice ecological (and environmental) ethics, formal education needs to get inspiration from the popular education model, promoting learning outside the classroom. Popular education differs from normalised approaches to education in that it is rooted in the experiences, needs, and aspirations of community members and promotes collective action [10].…”