Well, there&#x27;s two things.<p>It has been this warm for about ten thousand years. Before that there was a hundred thousand year ice age. The previous warm period that lasted about ten thousand years was called the Eemian.<p>It would be natural to try to search for marks of civilization from the Eemian period. 
But so far, only very simple stone tool artifacts have been found.<p><a href="http:&#x2F;&#x2F;www.christopherkellen.com&#x2F;posts&#x2F;eemian-civilization&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.christopherkellen.com&#x2F;posts&#x2F;eemian-civilization&#x2F;</a>