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This is the first in a series of five podcasts on "Ask a Climate Scientist," a series produced by NASA.  You can learn more about this series at http://climate.nasa.gov

In this podcast, Dr. Pete Hildebrand, an atmospheric scientist and recently retired Director of the Earth Science Division at NASA Goddard Space Flight Center, was asked this question about Carbon Dioxide and Temperature:

"Is there any merit to the studies that show that historical CO2 levels lag behind temperature changes, not lead them?"

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