The article provides a concise analysis of the energy problem development throughout the history of our civilization. The author describes the gradual increase of the number of energy sources since ancient times till the present day. The energy resources are classified according to their tangible appearance.
CyberLeninka Государственное образовательное учреждение высшего профессионального образования "Санкт-Петербургский государственный инженерно-экономический университет"