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A comment on Can we get to 350 ppm? Yes we can. Parent comment

Re:Can we get to 350 ppm? Yes we can by _puk on Saturday July 22, 2017 @04:30PM (#14829196)
"This is the furthest back that the ice front has been in recorded history."

I'm curious; in the context of the ice front, when does recorded history begin?

Are we talking, 10s, 100s, or 1000s of years?

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