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Permafrost is a feature of the cold regions of the Earth and is determined by climatic characteristics. Global climate changes, observed since the end of the 19th century, are 2-3 times more intensive in the Arctic regions than in the Earth as a whole. Current growth of air temperature provokes permafrost thaw, which lead to intensification of destructive geological processes and threatens infrastructure stability. The article presents current and predicted trends in permafrost parameters You will learn how old permafrost is, about contemporary permafrost extent and about the fate of permafrost in the future. The lecture will feature photographs from Alexey's personal collection, as well as materials from the world's leading permafrost scientists.