Using radiocarbon dating of 365 vegetation samples on Baffin Island in the Eastern Canadian Arctic, scientists determined that the level of warming now matches or goes beyond what occurred during a natural warm period about 5,000 to 10,000 years ago, known as the Holocene Thermal Maximum. These higher temperatures may even be the warmest for 120,000 years.
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Image is of Central Baffin Island. Image credit: Gifford Miller / University of Colorado Boulder.