Today, modern buildings are made of armed concrete, brick, ceramic tile, glass or carbon fibres, aluminium,cement and all kinds of synthetic paints etc.In order to get most of these materials, the environment is directly aggressed by the exploitation of the construction rocks or indirectly aggressed by the gases produced during the technology processes necessary to obtain the building materials. Besides, the energetic necessity of a household also requires conventional energy obtained by the combustion of fossil fuels, which raises the level of carbon dioxide in the atmosphere to an allarming figure and, consequently, leads to the aggravation of global warming.
    Our project aims at bringing to the spotlight, again, the traditional construction technologies used by our ancestors, technologies that do not require the use of energy or the consumption of fossil fuels (not significant quantities, anyway!). Besides, the economical efficiency and the sustainability in time of such constructions are considerably greater.
The alternative construction materials are the wood (especially for the mountainous regions), construction rocks, reed, bamboo,clay combined with sand and straw, sawdust and other wooden remains etc.The houses  made of these materials, besides the lower construction cost, also have a higher insulation level, which is relevant in terms of energy saving and healthy environment. These houses are also more resistant to natural hazards such as earthquakes and their usage period is a lot longer.
    In order to better understand how such an architectural approach can help preserve the environment,we went to Ulmoasa, a small locality not far from the city where we study, in order to see such a construction, built by three young people who were helped by volunteers from the entire world. This construction is a „dom adobe”-type construction, the materials used in the process being foundation rock and then a mixture of clay, sand and water, put inside sacks which were afterwards put one on top the other, in order to form the walls. The roof is made of wood and reed, the circular shape of the building and the high-pitched roof fitting perfectly into the natural landscape and also offering sufficient  interior space and a rapid disposal of the precipitation water.

    The green construction from the „Ulmu Base”  can be a  lesson for those who want to know how you can build costlessly and sustainably, affecting as little as possible the environment, but it can also be an opportunity to  learn as much as possible about permaculture, the surrounding land being specially prepared for such cultures. The obtained products are kept in a basement which is dug directly inside the mountain flank, with a natural ventilation system.
    After the visit to Ulmoasa, we wrote short essays describing this wonderful experience, the most interesting of them being published in our high school’s History/Geography magazine,called COGNITIO. We also want to project a few green houses, to present them to our colleagues or to other guests within an exhibition organised at the end of all our activities .