Abstract
In the wake of the United Nations' Sustainable Development Goals (SDG) and the reports of the Intergovernmental Panel on Climate Change (IPCC), the pressure is increasing to respond to the urgent need to combat global warming and preserve biodiversity. Drawing on complex thinking (Morin, 1977-2004) and an interdisciplinary approach (epistemology, philosophy, sociology, psychology, mathematical, etc.), this review will attempt to understand what is the ecological of action (Morin, 1980) in all its complexity, and will address the conditions, obstacles and changes of an epistemological, ontological and educational nature that this action requires. It will not to deal with the question of proposing concrete actions as of reflecting on the transformations in thinking that these actions require. The concepts of complexity, ecology of action, eco-ontology, resonance and capability, all of which contribute to understanding the world in all its complexity, will guide us as we sketch out what an ecologist of action might be.