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National parks as the most complex category of protected resources are provided for the overall sustainable development, and coordination of geography, tourism and nature conservation is a basic development orientation of these areas in the future. In order to analyze the state of environment, but also the impact of tourism on nature, the method of indicators of sustainable development of tourism of the World Tourism Organization (UNWTO) is applied in the paper in the case of the National Park Tara (Western Serbia). The study included analysis and evaluation of indicators related to the ecological value of the area and direct impact of tourism activity on the protection of nature.

The solar energy is widely used around the world for electricity generation and heating systems in municipal services. But its use is complicated in the number of territories with uneven receipts of solar radiation on the earth’s surface and large number of cloudy days during a year. A hypothesis on the possibility of application of individual solar collectors for heating of houses in the number of cities of Russia has been tested. The existing designs of solar collectors and checking the possibility of their application in northern territories of Russia are investigated. The analysis was carried out taking into account features of relief and other climatic conditions of the Perm and Sverdlovsk regions. As the result of research, the basic recommended conditions for application of solar batteries in houses of the northern Russian cities have been resumed.