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File: Figure1_NP_SOS_GlacialMax_1x1_map_large.jpg

Blue marble globe with Northern Hemisphere ice sheet at peak of last ice age

Image caption

Roughly 20,000 years ago, during the Last Glacial Maximum of the Pleistocene Ice Age, ice spread over much of North America and Eurasia. (High-resolution without annotations available.) Image by Climate.gov based on data from the University of Zurich Applied Sciences, provided by Science on a Sphere.