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The earth has one primary energy source -- the Sun.

The climate of the earth has had large changes throughout time.

*  The geologic record, plant remains, sediment records and a host of other sources of information show that periods of far cooler climates have existed.
*    The last major ice age ended around 10,000 years ago.
*    The global temperatures are now reaching the values that were "observed" in about the year 1100 A.D.

Since large changes of Global Temperatures are recorded in the past:

What are the causes of "Global Cooling?

Will there be future Ice Ages?

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