This study focuses on understanding the factors that encourage adults' environmental behavior. This mixed approach methodology study used 10 Likert type questionnaires to collect data about nine cognitive and affective components that might influence environmental behavior. The qualitative data was collected through open questions and interviews. The main sample included 656 participants from amongst Israel's working population. The questionnaires were found both reliable and valid. Most of the explored cognitive and affective aspects appeared to act as predictors of environmental behavior. The study indicates that environmental behavior is driven by "egoistic" concerns rather than by altruistic views and motivations.