We think this is what might have helped it through some of the ice ages.

BBC: Woollemi pine at Wiltshire College

Experts still don't know for sure what has caused the Earth's ice ages.

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Sea Level has regularly changed every 100, 000 years by up to 400 feet (130 m), in concert with the regular ice ages over the last three million years.

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Periodic ice ages going back 10, 000 years show extreme temperature swings, exceeding 6 degrees Celsius within 50 years in some cases, said Richard Sommerville, meteorologist at the Scripps Institution of Oceanography.

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As an explanation for the conundrum of the ice ages, this notion could only hold water if a mechanism for such large changes in atmospheric composition might be found in the real world.

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There is clear evidence that winter storms throughout southern Scandinavia were more frequent and intense during the multi-century Dark Ages Cold Period and the much more recent Little Ice Age than either now or other comparably warm periods.

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During glacial ages that exist about 90% of the time, our Northern Hemisphere is mostly covered with ice up to several miles thick.

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Scientists have previously established the existence of water on Mars in the form of ice at the poles and water vapor, and pointed to geological features that appear to have been carved by water ages ago.

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