ナショナルジオグラフィックさんのインスタグラム写真 - (ナショナルジオグラフィックInstagram)「Photo by @katieorlinsky | This particularly friendly yak was one of dozens of animals I encountered as I roamed around Pleistocene Park, a nature reserve, research station, and long-term scientific experiment, located along the Kolyma River in northeastern Siberia. The park was created by Russian permafrost scientist Sergey Zimov, and is run by both Sergey and his son Nikita. The Zimovs believe that by recreating the ecosystem of the Pleistocene era, which was dominated by grasslands and large, grazing animals that helped maintain and fertilize grass, they can slow down permafrost thaw. Grasses absorb far less sunlight and heat than trees or tundra. To test this theory, they imported yaks, wild horses, bison, and moose to the park. In 2018 the Zimovs joined forces with Harvard University geneticist George Church, who thinks he can clone a woolly mammoth. The hope is that one day those now extinct beasts will be stomping around Pleistocene Park. It is a long shot, but it is worth trying. Arctic permafrost is thawing much faster than expected, releasing carbon gases that could drastically speed up climate change.」6月21日 18時31分