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An artistic render of a reconstructed Arctic ecosystem during the early Paleogene (early Eocene) warmth, showing the Metasequoia dominated deciduous forests in lowland (close view) and the deciduous mixed conifer and hardwood forests on upland (distant view) under the low angle, low intensity, 24 hour Arctic light during late growing season. The extensive deciduous coniferous forest played significant role in controlling moisture recycling at high latitudes during early Eocene global warming. The reconstruction was based upon our research on Arctic fossils and isotope record and details see Leng and Yang (2009).