File talk:Vostok 420ky 4curves insolation.jpg
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Graph shows "current period" but is only 280ppm CO2, That's not "current." What is year zero?
[edit]Raquel Baranow (talk) 06:18, 6 March 2015 (UTC)
- The zero year on the graph is preindustrial when CO2 was 284.3ppm in 1832. Source Raquel Baranow (talk) 14:44, 6 March 2015 (UTC)