In times of social and moral crises, sport has often been called to boost individual moral development. By the same token, outdoor activities are viewed as good educational practices to enhance environmental responsibility. However, the present paper argues that these physical activities are currently following the same technological development trend as the mainstream society, and challenges this trend itself in terms of sustainability by critically asking this question: Do outdoor activities really enhance environmental responsibility? The research supporting this paper is (...) based on a qualitative inquiry using interviews with outdoor activities practitioners: mountain guides and white water sports instructors. The findings of this research show that environmental responsibility development depends on the sport contexts. It is fostered in slow and none-technological activities and lowered in fast and technological activities. The paper concludes with the following paradox reached by the preliminary research results: the birth of modern technology calls for greater need of environmental responsibility, but it may also prevent its development at the same time. (shrink)