There have been a number of significant climate changes in the geologic past. In order to appreciate what is happening to our climate now, it is important to understand past natural climate changes and their possible causes. We have just begun to delve into the realm of past climate changes in detail, but there is now a fairly good understanding of the major climatic conditions during the past 700 million years.
KeywordsSolar Irradiance Thermohaline Circulation Geologic Time Scale Continental Drift North Atlantic Region
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