Rising Carbon Dioxide Levels at End of Last Ice Age Not Tied to Pacific Ocean, as Had Been Suspected

After the last ice age peaked about 18,000 years ago, levels of atmospheric carbon dioxide rose about 30 percent. Scientists believe that the additional carbon dioxide---a heat-trapping greenhouse gas---played a key role in warming the planet and melting the continental ice sheets. They have long hypothesized that the source of the gas was the deep ocean.

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