We all know about the problem of overpopulation of the Earth. But in fact, huge territories remain undeveloped, and overpopulation occurs only in territories with the most favorable climatic conditions for life. The subject of the first article is building in water areas. It is especially important in water areas with high exposure to flood risk. In modern times traditional pile foundations are almost replaced by new structural elements. The next current topic in the article is the using of telescopic poles. They serve when preventing water-related hazards. When preparing for the construction in water areas, we should take into account the following: the climatic factors; the characteristics of the water body; and the best method used to build waterproof elements. In the second article, we will look at how to build buildings in extremely cold conditions. The key factors are: south-facing windows, dark colors and geothermal energy. It is necessary to design buildings taking into account local weather conditions and use all available resources, including sun, vegetation, rain and wind. There are three basic strategies followed by traditional architecture for structures at high latitudes: thermal insulation and energy conservation, the use of materials that warm up slowly for the interiors, and ventilation to eliminate excess humidity. Тhe choice of materials will have a huge impact on thermal insulation. Next, consider the construction of different types of houses in the desert. Homes built in a desert climate should reflect heat in summer and keep the cold out in winter. The heavy walls provide a thermal mass that slowly absorbs heat during the day and radiates it at night. The thick walls hold the heat in and keep winter cold outside. Modern builders add emulsified asphalt or Portland cement to increase the strength of the blocks and improve water resistance. To sum up, using territories unsuitable at first glance for life, we can solve the problem of overpopulation.