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Past Change.

Subjects: CLIMATIC changes; VEGETATION & climate; CLIMATOLOGYEnvironment

• Source: National Geographic, Sep2004, Vol. 206 Issue 3, p64, 2p, 4 Diagrams, 1 Graph

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When Life Nearly Came to an End.

• Authors : Hoffmann, Hillel J.

Subjects: STRATIGRAPHIC geology -- Permian; EXTINCTION (Biology); ENVIRONMENTAL degradationScience & Technology

• Source: National Geographic, Sep2000, Vol. 198 Issue 3, p100, 14p, 11 Color Photographs, 1 Diagram, 1 Map

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Now What?

Subjects: CLIMATIC changes; CLIMATOLOGY; GLOBAL temperature changesEnvironment

• Source: National Geographic, Sep2004, Vol. 206 Issue 3, p56, 17p, 13 Color Photographs

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