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Here twenty-two world-famous authorities from ten leading educational and government organizations discuss the nature and causes of climatic change and the effects which climate has produced on various elements in the natural world, both biological and physical. For example, many of the great steps in evolution came about as a result of climatic changes.
Evidence of changes in climate is found in geology, in the study of tree rings, in the geologic record of plant life, and from vertebrate paleontology; causes of these changes are sought in both solar and terrestrial influences.