Incan Empire Aided by Global Warming...

July 28, 2009 -- A 400-year warm spell helped the ancient Inca to build the largest empire ever to exist in the Americas, a new study has established. Beginning around 1100 A.D., the increase in temperature served as a "perfect incubator" for the Inca's expansion, an international team of researchers report in the current issue of the journal Climate of the Past...Link