<p>Environmental Motivation (EM) is conceptualized as a process of moral motivation, and examined from the perspectives of complex dynamic systems and self-determination theory. EM is a complex dynamic system that develops in multiple time scales. Relationships between multiple motivations constitute the activity of this system, out of which environmental behaviors (judgments and actions) emerge. As a dynamic system, EM displays substantial interpersonal differences, as well as intrapersonal variation in terms of differential strengths of multiple motivations over time and across contexts. The operation and development of this system is both individualized and contextualized, as EM is an open system in close connection with dynamically changing contexts. Support for autonomy, competence and relatedness is a property of dynamic contexts, which influence the development of EM in terms of increased integration and internalization. The development of environmental identity and sense of duty are central for the development of EM. A model for short-term and long-term development of EM is proposed. Implications for understanding the complexity of environmental behavior and facilitating EM are discussed.</p>