Stomata Story (IMAGE)
Caption
Fossilized leaves hold evidence of a sharp increase in carbon dioxide levels as the Antarctic ice sheet began to shrink 23 million years ago, a new study finds. This magnified image of a fossilized Litsea calicarioides leaf clearly shows the stomata, through which leaves take in CO2 and release oxygen.
Credit
Tammo Reichgelt/Lamont-Doherty Earth Observatory
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