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Published online 7 December 2000 | Nature | doi:10.1038/news001207-10
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Force of change not necessarily CO2
A glimpse at the deep past hints that carbon dioxide might not always have caused global warming, reports Heike Langenberg.
There is little doubt that increasing concentrations of carbon dioxide, and other greenhouse gasses, are to blame for the warming of the Earth over the past century. But new research suggests that today's main culprit may not always have driven the swings between greenhouse and ice-age climates on our planet since life colonized it 540 million years ago.
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