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Skyhunter
Skyhunter is offline
#13
Oct7-09, 11:33 PM
P: 1,409
Quote Quote by mheslep View Post
depending on when one starts counting of course. It's been down to 180ppm several times in the last million years.
And those doublings resulted in more than 3C, but were associated with changes in insolation and albedo flip.