More ammunition for those who think man-made global warming is a myth perpetuated by left-wing environmental nut jobs -- it turns out there was global warming centuries ago in areas where there were no humans.
It has been long acknowledged that there was a "Medieval Warm Period" 500-to-1000 years ago, but it was assumed that it was confined to Europe, which was of course populated.
But now the Daily Mail reports that scientists from Syracuse University in New York are claiming that the warming stretched all the way to Antarctica, which means it was not fueled by human CO2 emissions.
Lead researcher Zunli Lu said the evidence lies in a rare mineral called ikaite, which forms in cold waters.
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"Ikaite is an icy version of limestone," said Lu. "The crystals are only stable under cold conditions and actually melt at room temperature."
The water that holds the crystal structure together, called the hydration water, traps information about temperatures present when the crystals formed. That led to the team's conclusions.
Lu said the mineral also shows that there was a "Little Ice Age" 300-to-500 years ago.