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Abstract: Talking about the concept of “environment” means treating a multidisciplinary and interdisciplinary theme which revives a simultaneous consideration of multiple data social, economic, natural. To date, the protection of the environment as a whole becomes a challenge for many countries, policies for the preservation, education and scientific research strategies are aimed at the environment and sustainable development. It remains an idea of its young problem, still current. It is development that meets present needs without compromising the ability of future generations to meet their own needs. In the field of architecture and urban planning, environmental protection is an important place. With the growth experienced by this area, several environmental procedures have been invented to improve the quality of construction and use of buildings, a view mainly environmental but without neglecting the economic and social aspects. The environmental protection has long existed, it is found in the experiences of ancient cities such as Ksours. This legacy is an inspiration and an asset for the sustainable development of our cities today. According to Hassan Fathy only in the tradition, we respect and we continue the work of previous generation that new generation can really move and solve the problem. The materials used the distribution of space, protection of natural resources such as water and palm trees, recycling, are the strategies of the company of Ksours to live in a healthy and comfortable space. The objectives of this paper are: To highlight the history of environmental policy in architecture and urbanism in the world, in this case Ksours. Renewable energy and strategies of the preservation of the environment in the Ksours Sustainable development in Ksours: a notion that has long existed. Establish strategies to protect the environment. [Copyright &y& Elsevier]

Abstract: Today, innumerable damages caused by the city and the action of a man on built and natural environments, are recorded in majority of developed countries and also under development ones, which had created in the last few years, complex problems difficult to solve like: pollutions, destructions of natural and rural landscapes, uncontrolled rejections of waste, problems of water and frequent variations of the climate. Algerian cities haven’t escaped to this truth and this situation is related with the history of the development process adopted in Algeria, during the years of post independence. The development of these cities was done without looking for or respecting environmental requirements. Theoretically, Algeria has a complete building formed by different plans and schemes covering environment, land use planning and urbanism fields to raise this challenge and avoid errors of the past, particularly before nineties and after, by adopting a holistic approach and giving a broadest sense of environment protection. But until now, just a few great actions recently carried out by the ministry of land use planning, environment and tourism are registered, and the rest confirms that these tools don’t have any effect suspected on ground, for various causes. The most important causes can be resumed in the lack of dialogue and coordination efforts between concerning actors and theirs institutions, and the absence of an explanation relating to the whole approach able to make these tools even they were appeared in different laws, working as a united body. That''s why these instruments were ineffective and the situation became difficult and critical. The present paper will focus on this reality. [Copyright &y& Elsevier]