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Modern-day CO2 levels recorded about 15 million years ago

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