Today, the Republic of Tatarstan celebrates the 100th anniversary of the Tatar Autonomous Soviet Socialist Republic foundation. Specialists of the Ministry of Ecology and Natural Resources of the Republic of Tatarstan did not stand aside from such a significant event in the history of the republic and timed an environmental lesson to the holiday date. The thematic video lesson “100 years of the TASSR formation: stages of development of the movement of young nature lovers” was conducted for pupils of the Leskhoz secondary school of the Arskiy district.