John Wheeler: The Arctic was ice-free millions of years ago
The age of some ancient ice can be estimated from the percentage of certain isotopes of tiny gas bubbles frozen in the ice when it was formed.
Source: dglobe.com
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John Wheeler: Arctic ice is not as old as Antarctic ice
The most accepted theory based on a reconstruction of the past climate is that the North Pole has been capped in ice for about 2.7 million years.
Source: perhamfocus.com