YOUTH OF XXI CENTURY IN A SCIENTIFIC, CULTURAL AND EDUCATIONAL ENVIRONMENT: NEW VALUES, CHALLENGES, PERSPECTIVES Proceedings of the International Youth Scientific Conference.\r\nMoscow, November 20–22, 2017. - PART 2. 2017. P.. 37-39
Nowadays we witness global warming on the planet and, as a consequence, the decrease in the population of polar bears. But polar bears are all parts of different ecological systems.