![](https://webarchive.library.unt.edu/eot2008/20080920110140im_/http://nsf.gov/images/x.gif) News From the Field Earth's Bumpy Shift from Icehouse to Greenhouse World
![](https://webarchive.library.unt.edu/eot2008/20080920110140im_/http://nsf.gov/images/greenlineshort2.jpg)
January 4, 2007
![earth graphic](https://webarchive.library.unt.edu/eot2008/20080920110140im_/http://nsf.gov/news/other_images/1earth_enviro_l.gif) | Earth's transition from an ice age to an ice-free planet 300 million years ago was marked by dips and rises in carbon dioxide and extreme swings in climate. Full story |
Source University of California, Davis ![](https://webarchive.library.unt.edu/eot2008/20080920110140im_/http://nsf.gov/images/bluefadesm.jpg)
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