The “environments” in which we spend our daily lives are by no means created naturally. Cities, architecture, schools, hospitals, parks, offices, commercial facilities, and public spaces—all of these are shaped by someone’s deliberate design. Today, however, the underlying philosophy of that design is undergoing a major turning point. Until now, environmental design has developed primarily around functionality, convenience, economic efficiency, and quantitative expansion. Yet in an age marked by the accelerating severity of climate change, the rapid loss of biodiversity, the growing divide between cities and nature, the weakening of local communities, and the diversification of values, conventional approaches to environmental design alone can no longer sustain a truly sustainable society. What is now required goes beyond the traditional boundaries of design as a discipline. It is a new form of environmental design that integrates insights from a broader range of social fields—“environmental design × vision × future orientation × diversity.” In this article, we delve into fundamental questions such as “What is environmental design?” and explore why it must be connected with vision and a future-oriented perspective, as well as how it relates to diversity. We then break these ideas down into concrete, practical steps. By presenting a systematic explanation that is accessible to beginners while maintaining a high level of professional rigor, we aim to consider what a future-oriented model of environmental design can and should be.