evolução co2 ao longo os tempos

From Chapter 4. Rising Temperatures and Rising Seas
Lester R. Brown, Plan B 2.0: Rescuing a Planet Under Stress and a Civilization in Trouble

When the Industrial Revolution began, the atmospheric CO 2 level was roughly 270 ppm. The 377 ppm registered for 2004 is not only far above any level over the last 740,000 years, it may be nearing a level not seen for 55 million years. At that time the earth was a tropical planet. There was no polar ice; sea level was 80 meters (260 feet) higher than it is today

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