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Politics : Foreign Affairs Discussion Group -- Ignore unavailable to you. Want to Upgrade?

To: Wharf Rat who wrote (190751)	7/3/2006 12:30:23 PM
From: Wharf Rat	Respond to of 281500

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. 2 Message 22592434

To: Wharf Rat who wrote (190751)	7/3/2006 1:11:02 PM
From: Nadine Carroll	Read Replies (2) \| Respond to of 281500

We know that carbon has risen in the past 100 years. That is not the question. But many factors have changed during that period, not just the burning of fossil fuels. Number of humans/animals on the planet, forest cover, etc, have also changed radically. So the extent of the influence of burning fossil fuels, as opposed to these other factor, is questionable. And the function of the higher co2 levels is also questionable, as the reaction with the chief greenhouse gas, water vapor, is still under debate.