The rapid expansion of urbanized areas affects biodiversity, homogenizes landscapes and transforms lifestyles by making sensitive experiences of natural environments rare. On a global scale and for the last three decades, urbanized areas are gaining an average of 110 km² per day. This extensive urbanization has a profound effect on biodiversity and ecological functioning. The sealing of surfaces, the fragmentation of "green" spaces and the human activities characteristic of urban environments filter out plant and animal species, leaving only generalist species, capable of adapting to constraining environmental factors. With this growing recognition, on a global scale, of the principles of sustainable development, the local scale and the urban environment have appeared to be particularly favourable to its implementation. However, despite occasional successes and an interesting renewal in the consideration of nature in the city, the sustainable city has rarely gone beyond the conceptual stage to become a reality. Urban planning is a priority issue for improving our quality of life and reducing greenhouse gas emissions. It is important to build a green and sustainable city model that preserves our resources, our landscapes and our territory so that every citizen can enjoy a decent quality of life and the economic benefits of controlled urbanization. The places where we live are alive. They are bioregions, unique places to live with their own soils and landforms, watersheds and climates, native plants and animals, and many other distinct natural features. Each feature affects the others and is affected by them as in any other living system or organism. A bioregion refers to both a geographic terrain and a terrain of consciousness, a place and the ideas that have developed about how to live there. This new concept brings back the possibility of a truly sustainable and green city.

Anahtar Kelimeler: Bioregion, Biocity, Sustainable Devlopement