@CNN: European colonizers killed so many Native Americans that it changed the global climate, researchers say https://t.co/rIwnObW9dw https://t.co/FkCYLIvaO8

@CNN: European colonizers killed so many Native Americans that it changed the global climate, researchers say https://t.co/rIwnObW9dw https://t.co/FkCYLIvaO8