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CNN:Fossils show late Cretaceous arctic quite toasty

The fossils indicate that at least once in Earth's history high amounts 
of the greenhouse gas carbon dioxide warmed Earth to much higher 
temperatures than usual, according to scientists at the University 
of Rochester in Rochester, N.Y. 

The carbon dioxide was spewed by massive volcanic eruptions about 90
million years ago and as a result, Arctic temperatures were as warm as
present-day Florida.