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Background: Article analyzes various national and international aspects of the state of the system of legal support of public order and social security related to mass events.  Objective: to develop organizational and legal solutions aimed at creating an effective approach to solving issues of law enforcement and social security during the preparation and holding of mass public events.  Methods: dialectical method was chosen as the main research method.  Results: The article highlights the administrative-legal and organizational-tactical measures used by the internal affairs bodies and the resource enforcement of the law and social security during the preparation and holding of public events of various kinds. The authors highlight the legal and organizational bases for law enforcement and social security during the preparation and holding of public events in foreign countries.  Conclusions: New approaches to ensuring social security have been proposed for both internal affairs units and sanitary and epidemiological services in connection with the spread of the COVID-19 pandemic.

Impacts of the climate change on the space heating systems are discussed. We have used the latest global temperature data of the Global Climate Historical Network to demonstrate that the heating and cooling demand combined is decreasing in the world regions with boreal and moderate climate conditions almost everywhere. A simulation approach was developed to assess the impact of the climate change of the efficiency of a modern binary-cycle cogeneration power plant. Both statistical parameters of the air temperature and the thermal circuit of the power plant were modeled in details. It was found that even for a quite optimistic climate scenario the annual efficiency decrease may be as high as 1-2%. This means that careful consideration of the climate-related heating load dynamics is of key importance by implementation and renovation of the district heating systems.