the greenland ice sheet is at least 400,000 years old and warming was not global when europeans settled in greeland 1,000 years ago
the greenland ice sheet is at least 400,000 years old and warming was not global when europeans settled in greeland 1,000 years ago
north america:9
the pre-columbian era ended in 1492, with the beginning of the transatlantic migrations—the arrival of european settlers during the age of discovery and the early modern period.