Posted AT 12:35 PM EDT on 28/04/08
Humans upset climate cycle, study says
WASHINGTON — Before humans began burning fossil fuels, there was an eons-long balance between carbon dioxide emissions and Earth's ability to absorb them, but now the planet cannot keep up, scientists said Sunday.
The finding, reported in the journal Nature Geoscience, relies on ancient Antarctic ice bubbles that contain air samples going back 610,000 years.
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