What does green means ?

Green building is the practice of increasing the efficiency with which buildings use resources — energy, water, and materials — while reducing building impacts on human health and the environment, through better siting, design, construction, operation, maintenance, and removal — the complete building life cycle.

A similar concept is natural building, which is usually on a smaller scale and tends to focus on the use of natural materials that are available locally.^[1] Other commonly used terms include sustainable design and green architecture.

The related concepts of sustainable development and sustainability are integral to green building. Effective green building can lead to 1) reduced operating costs by increasing productivity and using less energy and water, 2) improved public and occupant health due to improved indoor air quality, and 3) reduced environmental impacts by, for example, lessening storm water runoff and the heat island effect. Practitioners of green building often seek to achieve not only ecological but aesthetic harmony between a structure and its surrounding natural and built environment, although the appearance and style of sustainable buildings is not necessarily distinguishable from their less sustainable counterparts.

Ecological living is a life philosophy. Proponents of ecological living aim to conduct their lives in such a way that they have an all-encompassing awareness of earth and its processes. Each choice made under such a way of life requires a consideration of the consequences of the choice, and the way that the decision will affect the environment and all living things within it. Ecological consciousness and care for the earth are of paramount importance in the decision-making process.

By minimizing their "ecological footprints" — the extent to which they create an environmental impact — proponents of ecological living hope to preserve the earth for future generations of human beings and other life. -wikipedia