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Discussing the mobilization of environmental associations from the sole sociological viewpoint of interest and calculations is no longer workable. Similarly, although the processual analysis of commitment has obvious heuristic virtues, it could be usefully completed to understand how it emerges and gets structured. This is why, in order to further develop this kind of analysis, we shall explore the processes leading to forms of organized commitment. To do so, Canguilhem’s research about the epistemology of living organisms will be used. It shows that, when the resolution of problems between individuals and their milieu is attempted, it is always initiated by the former. By using the notion of “concernment” and articulating it with those of environment and orientated behaviour, we intend to emphasize the singularity of the social dynamics that aim to solve the tensions inherent in environmental issues. Furthermore, through sociological analysis, one may get a glimpse of forms of similarity between “concernment”, commitment and cognitive mobilization. Our research is based on comparative data drawn from two surveys on the nuclear industry in France: one in Limousin concerning the uranium industry and another in La Hague, North Cotentin, dealing with radioactive waste.