Two interpretations of this recently promoted proposition:
While Europe was in the early days of the Renaissance, there were empires in the Americas sustaining more than 60m people. But the first European contact in 1492 brought diseases to the Americas which devastated the native population and the resultant collapse of farming in the Americas was so significant that it may have even cooled the global climate.
Lauren Kent, CNN, February 1st 2019
When Europeans arrived in the Americas, they caused so much death and disease that it changed the global climate, a new study finds.