The daily behaviors of human beings, especially those of the Western world, are having negative consequences on the environment, which, in addition to damaging it, are adversely impacting human health and well-being. From psychology came a proposal called environmental psychology to understand the psychological and contextual dimensions that would explain why humans behave in the way they do in relation to the environment; besides to investigate why sometimes the actions of the human being do not degrade but protect the environment, with the purpose of increasing this type of actions, known as pro-environmental, and diminishing the harmful ones. The present work is an exploration of these pro-environmental behaviors in a sample of undergraduate students of the University of Antioquia, located in Medellin (Colombia), belonging to five faculties, in order to identify if they show differences by sociodemographic variables (sex and faculty ) as literature has sometimes found (Corral, 2001), and if there are correlations between these behaviors with the other psychological dimensions of pro-environmental behavior evaluated: concern, attitude, belief and environmental intention. To achieve this, a 68-item protocol was developed, created specifically for this study, based on the combination of multiple instruments found in the bibliography ...