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| Description: Higher concentrations of methane (a) and carbon dioxide (b) in air bubbles trapped in ice cores indicate warmer interglacial times. Earth entered a warming interglacial period 20,000 years ago. Picture Stats: Views: 458 Filesize: 156.02kB Height: 1079 Width: 1235 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=22525 |