david raup | polaris93

polaris93

More from THE LIFE AND DEATH OF PLANET EARTH, mit comments by M. E.

polaris93 Jan 22, 2010 21:54

. . . [Earthly life] may have reached a steady state of diversity some time ago! Scientists also learned that biological productivity - the total amount of living plant and animal tissue on Earth - appears to have been higher 200 million to 300 million years ago, when the planet was warmer and richer in atmospheric carbon dioxide than it is today ( Read more... )

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