When palm trees gave way to spruce trees

For climatologists, part of the challenge in predicting the future is figuring out exactly what happened during previous periods of global climate change.

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<p><a href="http://www.physorg.com/news164464266.html">When palm trees gave way to spruce trees</a></p> <p>For climatologists, part of the challenge in predicting the future is figuring out exactly what happened during previous periods of global climate change. <br /></p>