Although both altruistic and ecological behaviors can be considered prosocially driven be-haviors, our psychological understanding of what motivates action in either the human or ecological domains is still in its infancy. We aimed to assess connection to nature and connection to humans as mediators of the relationship between prosocial propensity and prosocial behaviors in both the ecological and human domains. This study used empathy as an indicator of an individual’s prosocial propensity. The data for the study was collected through surveys in Russian (841 participants) and Spanish (418 participants). The study demonstrated that an individual’s prosocial propensity can be actioned into ecological (nature-related) behavior through connection to nature. Similarly, an individual’s prosocial propensity can be actioned into altruistic (human-related) behavior through connection to humans. However, the present study also demonstrates that an individual’s prosocial propensity can be directed to humans through a connection to nature. Thus, altruistic and ecological behaviors are two related classes of behavior, driven by the same prosocial propensity of the individual. This study is an important step towards generating scientific support for the claim that traditionally separate teaching of prosocial and environmental subjects should be combined into a single educational approach. An integrated approach will contribute to a multidisciplinary and interdisciplinary effort to create a society that is both ecologically and socially sustainable. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.