Сообщают, что нынешнее лето стало самым теплым за всю историю наблюдений - особенно в Сибири. Сделаю важное уточнение: наша история наблюдений весьма кратка - она и до "малого ледникового периода" не дотягивается. А после конца большого ледникового периода бывало и теплее - особенно в Сибири. Например, 3000 лет назад. Березы аж на берегах Северного океана росли.

Radiocarbon-dated macrofossils are used to document Holocene treeline history across northern Russia (including Siberia). Boreal forest development in this region commenced by 10,000 yr B.P. Over most of Russia, forest advanced to or near the current arctic coastline between 9000 and 7000 yr B.P. and retreated to its present position by between 4000 and 3000 yr B.P. Forest establishment and retreat was roughly synchronous across most of northern Russia. Treeline advance on the Kola Peninsula, however, appears to have occurred later than in other regions. During the period of maximum forest extension, the mean July temperatures along the northern coastline of Russia may have been 2.5° to 7.0°C warmer than modern. The development of forest and expansion of treeline likely reflects a number of complimentary environmental conditions, including heightened summer insolation, the demise of Eurasian ice sheets, reduced sea-ice cover, greater continentality with eustatically lower sea level, and extreme Arctic penetration of warm North Atlantic waters. The late Holocene retreat of Eurasian treeline coincides with declining summer insolation, cooling arctic waters, and neoglaciation.

https://www.sciencedirect.com/science/article/abs/pii/S0033589499921233 Это я возобновил работу над книгой по истории инноваций и попутно к первому занятию со студентами готовлюсь...