Modern-day CO2 levels recorded about 15 million years ago

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Anthropogenic Climate Change
Is the Earth's climate changing?
Sensitivity of Earth's climate to atmospheric CO2?
Climate highly sensitive to variations in atmospheric CO2
Climatic characteristics when current CO2 levels were last sustained
Modern-day CO2 levels recorded about 15 million years ago
CO2 levels of 330 to 500 ppm sustained during middle Miocene period
Rainfall distribution very different 15m years ago
Sea levels were at least 25 metres higher 15m years ago
Substantially less ice at the poles 15m years ago
Temperatures at least 3 degrees C higher 15m years ago
Graph of this discussion
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